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I'm not sure I'm familiar with PO854U (perhaps PO85U?), but in general, they differ in how aggressive they cut, and how glossy they finish.
There's a good table that sums these differences on AG's website, which you may find on this link:
Menzerna, Menzerna Polishing Compounds Products, Menzerna FMJ, menzerna polishes, menzerna car polish, menzerna nano polish, menzerna final polish,