Most parts - and thus masts and sails - should be interchangeable between the 5135 and the 3940 (US 3286) as the same moulds are used (with perhaps a few small modifications).
Case rests with the (fake) cannons below deck of course, of which we don't yet know if they are removeable or not. I hope so, I'd like to install cannons like on the 3940.
So I think I'll really like the 5135 (mostly nice colours), as much as the 3940 (except if the 5135's cannons look too fake).