It looks to me like the fans are different between those two.
It looks like a fan from a g450, g450a, g450m, g455 and a g550 will fit. The Model number on the fan itself should read, AB7005MX-ED3.
It looks like the heat sink is specific to your machine. ATOOT0020R0 should be the number on the heat sink itself.
It looks like things changed between the Models GX5X and the GX6X.
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