According to the information I know, the main differences between the JD Wireless Treasure B plug-in and the B+ plug-in are in the following aspects:

1. Supported router models: The B plug-in supports fewer router models, mainly including some models of brands such as Huawei, TP-Link and Xiaomi, while the B+ plug-in supports a wider range of router models and can be adapted to more brands and models of routers.

2. Functional features: The functional features of the B plug-in and the B+ plug-in are slightly different. The B plug-in mainly provides some basic router management and optimization functions, such as router firmware upgrades, router password changes, router IP address management, etc. The B+ plug-in adds more advanced functions on the basis of these basic functions.