Difference between DDEC and 6 pin

I have the VMSpc with the 6 pin usb connector that I used with my Cummins 400 motor. I have now have a Detroit Diesel 515hp and noticed that there is a DDEC version module. Can I use the 6 pin I have or do I need a new wire or module??

I do have my 6 pin version installed and it seems like everything works - except the speed jumps all over the place