Light switch wall plate metal finish comparison.
Light switch wall plate metal finish comparison - brass and bronze, steel and aluminum, painted metal colors.

Power outlet plates fit a range of heavy duty power source receptacles.
Example of a heavy duty electrical receptacle that can be used in power outlet plates. They fit a variety of receptacles similar to this type that come in 30A, 50A, 60A, 2-Pole, 3-Pole, 4-Pole, 3-Wire, 4-Wire, grounding or non-grounding varieties with different blade layouts. (Electrical device not included.)

Comparison of Several Large Round Power Outlet Covers
Power outlet plates come in a range of sizes including single gang, double gang, offset with a variety of opening dimensions. Check your measurements as openings come in various diameters that are just slightly different from each other.