Klaus486 is on it. BTB's are 35" scale and have wider necks, as well as larger bodies.
Two different lines to appeal to two different types of player.
All the best,
ESP Ltd B-1005, ESP Ltd Surveyor-4, ESP Ltd B-4Z (inbound) Squier VM Fretless P, Squire Affinity Jazz V Fretless (in work), Mesa Walkabout Scout