It would be difficult but recommended that you compare the two BIOS files with some type of software tool, as that might give you a clue as to how it might affect your 5700XT. It could severely hamper the performance, or it might bypass that defective memory chip if you are lucky. I would only try this on a video card that I have written off, meaning you have a replacement ready to go.
The engineer still lurking within me thinks that the attempt will simply just fail to activate. I bet it will say that the file isn't compatible or something like that.
As Albert Einstein said, "I could have done so much more with a Big Al's Computer!".