GB002 and GA002 are two completely different micro.
– The GB002 has everything you need to connect to USB
– The GA002 is the version without USB
It is not about being “critics”, in electronics you have to use the right components.
If we wrote GB002 you must necessarily use GB002.
Or, if you really want to make variations, before buying the components you have to study the datasheet well to see if it can be done.