BHB and BHS aren't the same strings.
Originally Posted by Torres
BHB and BHS definitely play differently though I'm not convinced that they're the same string. BHS is noticeably lower powered than BHB and less springy.
The two different colored BBOs also play slightly differently. Again Chris from TW also shares that view.
Haven't tried both colors myself but there are comments on these boards from a few people who say that the graphite and the yellow Yonex PTP play slightly differently.
And those are just the polys.
Everyone knows that there are quite a few nylons that definitely play differently between the different colors - primarily in terms of stiffness eg. Gosen Micro white/black/natural/blue etc, Tecnfibre X1 red/natural etc.