Kramer worked for Travis Bean before he went out on his own. There are two major design differences. Where the TB has a full aluminum neck, the Kramer has an aluminum “T” with wood wedges inserted so, looking at the back of the neck, it looks like a wooden neck with an aluminum stripe down the middle. IMHO the Kramers feel nicer. The guy I played with many years ago that played a Travis used to complain that the neck never warmed up - especially on outdoor gigs.
The other major difference is that the Kramer is a regular bolt-on while the TB neck runs 2/3 of the way through the guitar with the pickups and bridge mounted in the same chunk of aluminum that comprises the neck - almost like a neck through.
Another difference is that the Kramers always seemed a little lighter to me. The TBs are boat anchors. I’ve never understood their popularity or the exorbitant prices they now command.