Oh, my fault -- your original explanation is clear. I read and wrote too quickly without properly processing what you were saying.
Yes, PSYCH201 and MA121 are the same. In our original configuration, we had such cross-listed courses -- the conceit being that everything in the psychology "major" should be a psychology course, even if we were just importing a math course and giving it a psych ID.
So, yes -- MA121 is what you would want: https://learn.saylor.org/course/ma121
I will take "PSYCH201" off of that page.
Thanks for clearing up my mistake!