Do you have a room-only reservation with tickets attached or a package?
When we did this last year with a room-only, we kept our FPs because we kept the tickets attached. If it is a package, then you will probably lose the FPs when the package is cancelled because the tickets will go away. The MBs should stay attached to your account and can be used with your current tickets or tickets in the future. That is just what happened to us, I don't know how it works for sure now.
There is a big Throwaway Room thread (if you google it you can probably find it) that might have these answers since it's the same idea.