I don't know about all these numbers but there were two G75VW 3D version with 120 hz monitor and standard with out 3D and 60 Hz screen They had different connectors. I don't remember any other major differences.
G752VY-DH72 Win 10 Pro
512 GB M.2 Samsung 960 Pro
1 TB Samsung 850 pro 2.5 format
980m GTX 4 GB
32GB DDR 4 Standard RAM
Z97 PRO WiFi I7 4790K
Windows 10 Pro
Z97 -A
Windows 10 Pro