You would think a color in MS Office would be a color in MS Office but apparrently not.

Further searching on this came across a converter for Access OLE Colour, RGB & HEX values in a post at ACCESSWORLD Forum from 2018,
and again at DEVelopers HUT that sounds like an update of the same converter.

I don't use Access so not testing them out, and I've never heard of OLE color.
If nothing else might give some more insight into what's going on.