thank you so much/sorry so much

[gwbook4]

Hello!

Could you tell me if these expressions are right? Are there any differences in usage between them?

Thank you very much. = Thank you so much.
I am so sorry. = Sorry so much.

Thank you!

 

[NLmarkSE]

Thank you very much. = Thank you so much. Correct
I am so sorry. = Sorry so much. Incorrect: Sorry so much sounds very odd.

 

[Language Hound]

I agree with NL.
Since in your first example, you go from "very much" to "so much,"
I would propose the following:

Thank you very much. = Thank you so much.
I am very sorry. = I am so sorry.

(We also say, "I am so very sorry.")