I'm looking at these chain rings and I want to make sure they're compatible with my existing 36/46T crank set:

FSA Pro Road S9/C10 34t 110mm Black Chainring (use w/50t) - FSA

FSA Pro Road Chainring - 110mm Black, 110x36T S10

I know my bolt circle is 110mm, but the first link says "use w/50T" (I have 46T). The second link says "S10" in the title - is that 10 speed? Second link says "S9/C10", which I don't understand.