This is one of three plecos i've gotten from a LFS, they were listed as chocolate zebra plecos. These are not from a breeder but a supplier, which has been known to switch up fish (like albino neon tetras instead of cardinal tetras or sending in h. strictus/bellotii instead of rummynose).
This one is brown to black in coloring when not stressed with cream colored markings.

This picture has off coloring, was trying to get a clear head shot.