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The M back door is thinly-drawn (formed) sheet metal, fast and easy to make from brass or steel. There would be no cost advantage to go to die-cast zinc for a part like this. It's not magnetic on any of my Ms (2,3,4,5,6 & 7) so it isn't steel. While it could be formed from aluminum these days, I expect even with the cost of brass material it would still be brass for today's models. Brass can be painted or plated, so the finish wouldn't require different material for different models.

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just for information my m3 back door is aluminum

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