[Q] NEED ADVICE on flashing stock roms

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I have an Orange branded phone. Its build number is GINGERBREAD.BVJVC. I heard that you could only flash stock roms that is from the same region. Apparently Europe is XXJV(one more random letter). But mine starts with BV. is this because it is Orange's rom? Or does this not matter and can i flash with any rom including branded ones even with a different firmware (basically different everything).

On the site sammobile(.)com can find your correct branded firmware.

thank alot