I think you mean the VMG3926-B10A. I don't think there is a B10B variant.
Your AA page here states
It's believed that the VMG3925 has an extra common-mode noise filter on the telephone line. Kitz discussion
It then links to a discussion about 2 devices, that confirms a different device has the filter.
The VMG3926-B10B has the filter in but I'm not so sure the
VMG3925-B10B does unless they changed the shape/look of the filter.
Service: FTTC Unlimited (55/10)
Modem/ router: Billion BiPAC 8800AXL
Current sync: 55000/ 9875