Since the Tilt has partial internal routing you'll have to disconnect the hose from the lever anyway when you switch the brakes over. That being the case I think I'd error slightly long on the N9 rear brake hose so it can be trimmed perfectly when you switch it over to the Tilt. I'm kind of a perfectionist when it comes to hose/cable length though.
If the stack heights and fork travel are similar between the 2 bikes then the front hose length would probably be ok for both. Again, not such a big deal to trim it a little shorter though.