[SoCal Al]

Before anyone asks I tried looking for this topic in previous threads but couldn't find it so if it's already been dealt with I'd be thankful if you would re-post the link.

So here's my question:

I have a 2014 Super Record Compact crank set with 175mm arms and my fitter is recommending 172.5mm arms. Since I don't want to buy a new 2014 crank set ($400+) and used 2014 SR 172.5mm Compact's are pretty rare but Standard's seem plentiful, can I take a 2014 SR Standard with 172.5mm arms and swap out the chain rings for the compact ones (i.e. go from 52/39 to 50/34)?

Thanks in advance!