PAL and NTSC both are the same in terms of the size PCB slot to my knowledge.
The problem you are looking at is a cheaply made non-uniform cart shell.
I have a number of Taiwan Cooper games that are NTSC but they wont fit properly in my 2600 or 7800 because of the cheap shells that are so poorly made.
I dont know if any solution.
Sometimes people will use something like a Videogame Brain as a pass thru device for cartshells that dont fit properly in their console. Its a Fairly common problem with Imagic, Activision and M-Network shells in the 7800.
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Thanks, I'll try to open it up to insert the pcb by itself to see if it works.
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