How do we migrate SSL certifcate between sandboxes

Finally got the right way!, same certificates can be installed across sandboxes with the the below steps: On the source sandbox

1. Security Controls -> Certificate and Key Management
2. Click on Export to Keystore
3. Provide a Keystore password
4. Click on export
5. A file Java Keystore format with extension .jks (e.g. 00D180000001XWw.jks)

will get downloaded to local system

On target sandbox

1. Security Controls -> Certificate and Key Management
2. Click on Import from a Keystore
3. Choose downloaded jsk file and provide Keystore password and click on Save
4. All certificates inside the Keystore imported to target sandbox.