When you say “Reb Moshe” is that Rav Moshe Feinstein (I just want to be absolutely clear, on that)?
If so, did he say C’S’ and C’Y’ were “equivelent” in those exact words?
Did he make it clear he held that there was absolutely no difference between them?
You say “No, not exactly!”
Then what “EXACTLY”, are you saying?