What MS told me is that you can apply hotfixes (i.e. anyhting but objects, so executables, dll's, etc) to any country version. It's the objects that you need to be careful with.
I am based in the US, so you should verify this with either your NSC or with MS, but I think you should be able to use all hotfixes.
I think it would depend on the file being replaced. Many are ok but some, like the fin.stx, hold country specfic information. Which if it doesn't tie up with the country setting in you fin.flf will stop you opening the client.
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I am based in the US, so you should verify this with either your NSC or with MS, but I think you should be able to use all hotfixes.
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