Interesting info . The way i see it,those JetWay boards are the same AM2+ ones like somebody already noticed.They provided the BIOS support for AM3 chips and re-branded these as AM3(ready). We have already seen ECS DDR3 AM3 board,the "true" AM3 board that has AM3 socket+DDR3 memory support.

As for pins(or holes) in AM2+/AM3 sockets,looks like AM2+ could fit in AM3 boards.Phenom II AM2+ version,should be essentially the same as Phenom II AM3 version ,only having the extra pin(or two if AM3 is 938 pin).AM3 socket on the other hand seems to have 940 or 941 "holes".