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Look at the face plate on the pump itself. It will say ZF like this one that I pulled off my 1993 400E. You may need some brake parts cleaner to clean the grease off the plate to read it.
FWIW, I once ran out of MB power steering fluid after changing the reservoir and resorted to Ford ATF instead. I noticed that it was making the same type of noise you describe in your post.
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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles
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