Boss Flangers : BF2B vs BF2 (Japan or Taiwan)

[i2k]

Anyone could tell me what are the differences between BF2B & BF2 ?
Looking at the schematic of BF2 and actual BF2B (I own one), I guess BF2 is more metallic (I always though that BF2B is subtle). BF2B also has shorter delay BBD chip, so the flanger could be wetter than BF2. Am I correct ?

There's a used Taiwanese BF2 but I'm not sure if it's really worth it as I already have BF2B.

Thanks