Why trade if you don't have to?
1. The full size has some advantages for some things like the compact has its advantages.
2. One can never have too many firearms.
My suggestion is to get the compact and keep the full size. Controls are similiar, chances are good that the compact will accept the full size mags (if needed).
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)