Your probably correct and no-one would dispute the CARDS ARE PROBABLY the same. The OS used on the cards is DIFFERENT. The OS (Programmed) searches for certain information and 'computes' it. If the 'gam' , 'gos' file etc is not written in the SAME FORMAT the OS requires, then Whammo! No Go.
The orig 'Gamma' require an ext 'gam' the sellers requires a 'gos'. The the files then have to correct.
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