Except for carburetion, the O.S. Max .15 FP and .15 FP.S are identical. You can put the .15 FP carb on the control-line version with no problems. Here are the stock numbers and list prices of the parts you asked about:

OSMG2486 21781000 CARBURETOR #15 .15 FP US$31.99

These parts can be ordered through any hobby retailer who sells O.S. Max engines and accessories.