Water pump for Honda WL 30 XN and Honda WB 30 XN. What is the difference?

Water pump Honda wl 30 xn and Honda wb 30 xn What is the difference? For the specifications of the water pump itself, there is no difference but for the engine that drives it, it's different for the WL type itself, it uses a Honda GP type drive and for the WB type it uses a GX type drive, so the difference is only in the drive. Thanks.