I am unaware of non-OSM data being available in the
country/state/etc. obf files. I find that the data matches
OpenStreetMap, except that some OSM elements aren't carried over to the
obf, usually obscure things. But shops, restaurants it matches exactly.
I know because I use OsmAnd to notice what is wrong in the field and
then edit OSM later fairly often, and it all seems to match.
Can you explain more precisely which file you mean and what you find
that is not in OpenStreetMap?