I don't have access to my own PC to check the hash files of the 2 boot bins, but even if they are in fact identical that does not indicate anything regarding voice. Safest to use the US boot bin with EU fw_all and HWID overrides. The functions for voice etc are contained in fw_all.bin, but then you will maybe need to load a voice file to enable your specific language. Without a US unit to test this on, I cannot give you any further specific help, perhaps someone else can comment and help.