I wouldn't say "darker" - I think the CE-2B has a slightly higher roll-off on the bottom end than a CE-2 (the cap after the chorus circuit) which leaves the lower (chorused) frequencies cleaner - which gives it a more subtle feel.
Thanks most appreciated.... I swim in pedals....but I like my old and newer Boss and Ibanez stuff quite alot. Have a charm and character not found in the world of boutiques and alikes. A real backbone thing such a Boss pedal...plus I have had them ever since I started playing.