| I have both, mostly they are the same based on the same structures, but there are lots of differences.
The GT-10 has the AutoRiff, and Wave Synth effects, where the GT-10B does not.
The GT-10 does not track that well on some effects like synth, and harmonist well with a Bass below 'A'.
The GT-10B has XLR outputs, and a multi band compressor, and a frequency divider for the A/B channel paths, so effects can be applied to a certain frequnecy range, or use it for a crossover.
The GT-10 has 2 preamps, the GT-10B has 1, but the 10B pre can be moved anywhere in the chain, where the 10 ones are fixed to the A/B channel paths.
The GT-10 only has guitar preamp types, the GT-10B has a selection of bass and 4 guitar preamp types.
Apart from those differences, they are identical.
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Fender Jazz V and Rick 4001, GT10B/GT100, GR-55, VT-Bass, Marshall bass stack. Free Boss GT and GR55 editor available at fxfloorboard.sourceforge.net
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GT-10 vs. GT-10B compare/contrast? 
