Does the ending change if you collect all 200 strawberries?

You only need 150 strawberries to achieve the best ending. Collecting all 200 strawberries will add a golden strawberry stamp to your save file, but it will not change the ending.

The video above by Git Gud shows that there are 5 different endings for Celeste. I have transcribed each ending below with the number of strawberries needed and a screenshot of the final pie.

Ending 1 (0-29 strawberries)

Theo: I guess this is technically a pie...

Mr. Oshiro: Is this some kind of joke, Ms. Madeline?

Old Woman: Strawberry pies are supposed to have strawberries in them, dear.

Ending 2 (30-49 strawberries)

Theo: Madeline, I super appreciate you baking for us... But I don't think I can eat this.

Old Woman: It's the thought that counts.

Badeline: You people just can't appreciate good food. I'll eat all of it myself.

Madeline: You don't have to do that.

Badeline: Yeah... it was an empty threat.

Ending 3 (50-89 strawberries)

Mr. Oshiro: The important thing is that you tried your best, Ms. Madeline.

Badeline: Who invited this guy?

Theo: Come on, it's really good.

Old Woman: I've certainly had worse.

Theo: Thanks for the pie, Madeline.

Ending 4 (90-149 strawberries)

Old Woman: I'm impressed! This gives my baking a run for its money.

Badeline: Not bad.

Theo: Holy crap! This is so tasty!

Mr. Oshiro: Ms. Madeline, are you available to cater our re-opening banquet?

Theo: Can I take a slice home for Alex? She'll die when she tastes this.

Ending 5 (150-200 strawberries)

Theo: Madeline. This is the best thing I've ever tasted!

Madeline: Come on. Be honest.

Old Woman: He's right, dear. This is delicious.

Mr. Oshiro: It's truly magnificent, Ms. Madeline. A symphony for the taste buds!

Badeline: Can I take partial credit for this?

Madeline: Wow, thanks everyone. I worked really hard for it.

No.

According to the uploader of this 100% deathless run on YouTube, collecting 200 strawberries adds a golden strawberry stamp to your file, but the ending scene is the same as it is with 175 strawberries.