F1 to M1

I just finished my 1st year (out of 2) of training but I'm in the process of changing to a school that works with an M1 but starting in the 2nd year there because the programs are very similar.

So when I finish I'll have done 1 year on F1 and one on M1..

Anyone knows how this will affect my OPT?

Because I've heard that some people who only did 1 year of studies (F1) managed to get an OPT anyway.

This is acting school.