Magento 2: Migrate only Customer and orders

Install Data Migration Tool

1. Check your Magento 2 version :- sudo php bin/magento --version

2. Install Data Migration Tool from repo.magento.com :-

   composer config repositories.magento composer https://repo.magento.com
   composer require magento/data-migration-tool:<magento_version>

3. Configure Magento 2 Data Migration Tool :-

   1 The below file will contain configuration and scripts for migrating from Magento 1 Open Source platform to Magento 2 Open          Source platform.
        <your Magento 2 install dir>/vendor/magento/data-migration-tool/etc/opensource-to-opensource
   
   2 The below file will contain configuration and scripts for migrating from Magento 1 Open Source platform to Magento 2 Commerce.
        <your Magento 2 install dir>/vendor/magento/data-migration-tool/etc/opensource-to-commerce
   
   3 The below file will contain configuration and scripts for migrating from Magento 1 Commerce to Magento 2 Commerce.
        <your Magento 2 install dir>/vendor/magento/data-migration-tool/etc/commerce-to-commerce
   

4. Configuring the migration :-

   1 Change to the following directory :-
     <your Magento 2 install dir>/vendor/magento/data-migration-tool/etc/<migration edition>/<ce or version>
   
   2 Rename config.xml.dist to config.xml 
     cp config.xml.dist config.xml
   
   3 Open config.xml in a text editor.
   
   4 Specify the following at minimum:
   
           <database host="localhost" name="Magento1-DB-name" user="DB-username" password="DB-password"/>
   
           </source>
   
           <destination>
   
           <database host="localhost" name="Magento2-DB-name" user="DB-username" password="DB-password"/>
   
           </destination>
   
           <options>
   
           <crypt_key>Magento1-Encrypted-Key</crypt_key>
   
           </options>
   

5. Migrate settings :-

       php bin/magento migrate:settings --reset vendor/magento/data-migration-tool/etc/<edition-to-edition>/<version>/config.xml
   

6. Migrate Data :-

       php bin/magento migrate:data --auto vendor/magento/data-migration-tool/etc/<edition-to-edition>/<version>/config.xml
   

7. Migrate Delta :-

       php bin/magento migrate:delta --auto vendor/magento/data-migration-tool/etc/<edition-to-edition>/<version>/config.xml
   

Config.xml

<steps mode="data">
     <step title="Customer Attributes Step">
         <integrity>Migration\Step\Customer\Integrity</integrity>
         <data>Migration\Step\Customer\Data</data>
         <volume>Migration\Step\Customer\Volume</volume>
     </step>

    <step title="Map Step">
         <integrity>Migration\Step\Map\Integrity</integrity>
         <data>Migration\Step\Map\Data</data>
         <volume>Migration\Step\Map\Volume</volume>
     </step>
     <step title="OrderGrids Step">
         <integrity>Migration\Step\OrderGrids\Integrity</integrity>
         <data>Migration\Step\OrderGrids\Data</data>
         <volume>Migration\Step\OrderGrids\Volume</volume>
     </step>
     <step title="SalesIncrement Step">
         <integrity>Migration\Step\SalesIncrement\Integrity</integrity>
         <data>Migration\Step\SalesIncrement\Data</data>
         <volume>Migration\Step\SalesIncrement\Volume</volume>
     </step>
</steps>

As Per Your Requirement Config File Like This

Please do the changes in the data-migration-tool/etc/opensource-to-opensource/1.9.3.1/config.xml. You can rename the config.xml.dist to config.xml. You can comment out all other steps except these. Please follow this for detailed instruction https://devdocs.magento.com/guides/v2.3/migration/migration-tool-configure.html

<steps mode="data">
        <step title="Customer Attributes Step">
            <integrity>Migration\Step\Customer\Integrity</integrity>
            <data>Migration\Step\Customer\Data</data>
            <volume>Migration\Step\Customer\Volume</volume>
        </step>
        <step title="Map Step">
            <integrity>Migration\Step\Map\Integrity</integrity>
            <data>Migration\Step\Map\Data</data>
            <volume>Migration\Step\Map\Volume</volume>
        </step>
         <step title="OrderGrids Step">
            <integrity>Migration\Step\OrderGrids\Integrity</integrity>
            <data>Migration\Step\OrderGrids\Data</data>
            <volume>Migration\Step\OrderGrids\Volume</volume>
        </step>
        <step title="SalesIncrement Step">
            <integrity>Migration\Step\SalesIncrement\Integrity</integrity>
            <data>Migration\Step\SalesIncrement\Data</data>
            <volume>Migration\Step\SalesIncrement\Volume</volume>
        </step>
</steps>

If you want delta migration to be performed(migrating recent data after last migration) please configure this

<steps mode="delta">
        <step title="Customer Attributes Step">
            <delta>Migration\Step\Customer\Delta</delta>
            <volume>Migration\Step\Customer\Volume</volume>
        </step>
        <step title="Map Step">
            <delta>Migration\Step\Map\Delta</delta>
            <volume>Migration\Step\Map\Volume</volume>
        </step>
        <step title="OrderGrids Step">
            <delta>Migration\Step\OrderGrids\Delta</delta>
            <volume>Migration\Step\OrderGrids\Volume</volume>
        </step>
        <step title="SalesIncrement Step">
            <delta>Migration\Step\SalesIncrement\Delta</delta>
            <volume>Migration\Step\SalesIncrement\Volume</volume>
        </step>
</steps>