Regarding Linking CO FF with UA FF accounts:

I have 2 CO FF accounts, 71k on one and 51k on the other.

If I link one of these now, what is going to happen if I still have the other unlinked with miles hanging there. Will they cancel that account and bar me from using those miles or transfering those to the previously linked CO/UA accounts? The miles were only obtained from card applications and not flights.