I just got an OBP-1 from a a fellow TB'er and it is a different shape and size from the one I have in my fretless SSW 4'er. The one that is in my SSW is about the size of a postage stamp and about 1cm thick... The one I just got from the TB'er is about dbl the length, but same thickness... Other than size and shape, are there any tonal differences? I'm assuming one of them is older that the other... Anybody notice this as well?