Yes you can. I don't know why you would hook them both up at the same time, but I have been using and maintaining just one fairly involved and detailed set of favorites lists for almost 2 years.
By doing this, all the quick keys and systems are exactly the same in both radios. Makes life easier.
Do the same thing with the hp1 and hp2 in that Sentinel version, and 396T, 396xt, 996xt, 996p2, 325p2, and 15x using Freescan.
Mark
536/436/WS1095/HP1/HP2/996T/996XT/996P2/396XT/325P2/PSR800/15X/others