RC02 is the redesigned brake system from the 2017 XC60
Probably just a different caliper carrier bracket. This is what Audi did on the B8 A4 vs S4. S4 had bigger rotors than the A4, but the same caliper on a longer bracket. Should make it an easy upgrade if that's the case.
Unfortunately RC01/RC02 use different brackets, calipers, rotors, and pads. Just learned this lesson on my XC60 over the weekend, 2016 R-Design Polestar Platinum. None of the parts are compatible, you either have RC02 or RC01. Took me forever to figure this out and figure out which is which. I hope I can save you the headache I ran into.
36002410/36002411 Calipers - RC01
36012489/36012490 Calipers - RC02
Look at the diagrams on the volvo part stores, easiest way to figure out which you are is rotor width or caliper clip style. RC02 has a very different looking clip, again check those diagrams. If you can tell without taking the wheel off if your calipers are single piston or dual piston that will also tell you. Single piston is RC02.
RC01 - 328mm rotor, dual piston caliper, pads are wider
RC02 - 324mm rotor, single piston caliper, slightly narrower pads
I realized this when I found a single piston caliper instead of the dual piston I was expecting. Don't trust part sites fitment guides unless they say specifically RC01/RC02 for a part, some sites don't even include the RC02 parts in the search. Parts geek did specify RC01/RC02 but you have to know which version you have for that to be useful.
I looked into replacing the calipers on my RC02 with the RC01 calipers since dual piston and 4mm larger rotor makes me think they would perform better but If you look at the diagrams on the volvo parts store RC01 & RC02 have completely different designs, brakets, everything. If you look at the 2017 parts it looks like RC02 was lifted straight from the 2017 XC60 and must have made it onto later 2016 models to address the brake noise issues with RC01.
Good luck, let me know if you have any more questions, I hope you didn't waste the amount of time I did on figuring all this out the hard way.