I think lip-synching has been around for a while. Lip synchronisation is the name of a procedure for synchronising dialogue soundtrack and filmed image in films, whether in their original production or when dubbing. It is also used in the music industry when in so-called "live" performances the sound is actually pre-recorded and the performer simply moves his/her lips or sings on top of the powerful soundtrack. There are numerous examples of music "stars" out there who lip-synch.

So maybe you could "synch" instead of "sync"? As in "I synched my computers"?

(doesn't that sound weird anyway...)