>>409723292
Select the mesh you want to transfer to
Shift select the mesh you want to transfer from
f3 to open search
Transfer mesh data
Vertex groups
Change vertex mapping to nearest face interpolated (although rarely nearest vertex will work better)
Source Layers Selection: either select one or all of them depending on what you need to do

I'm using blender 2.8x still so hopefully these steps haven't changed in newer versions
If you want to transfer a few separate weights then you can repeat from f3
That said I don't think transferring boob weights from one model to another will be amazing and it'll be disappointing, so make sure to backup and etc.