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Repointing a PATCH ?!?

That's probably pretty easy. I assume that the way the patch format you're looking at works is basically by having a load of "go to offset X and write bytes A, B, C, D, …". So you'd just need to study the format and then tweak those Xs into the appropriate Ys for your ROM.
 
Well, that's an IPS file. So here's the specification for how those files work. I found it by Googling "ips format description". You can see that IPSes do in fact contain an offset part, so that's what you'd be identifying and repointing (a whole load of times, presumably; although you could write a tool to do that for you if you're a programmer).
 
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