Saving Old Seagulls

Hi, are the crankshaft, piston assembly and crankcase for an early Century (CPC) interchangeable with a TC 102? I have a complete baseplate and crankshaft etc from an old CPC and I need to replace the 102's baseplate as the magneto is dead. I was just wondering whether I can just swap the complete assembly? The 102 crankshaft is not in good nick, so there is a reason for me wanting to do this apart from the magneto.
Thanks

Have an AC 102 '55-'56 that has had the cylinder swapped onto a WSPCL 1977 crankcase, with rod piston and rings. Slid damaged square head off, slipped 102 cylinder on, used 102 leg and gearbox, works great! Put some hours on it past season no problems.