I don't think that UK has "airways" as such.
What the UK has is certain areas of controlled airspace, a lot of which happens to be Class A, and it is called "airways" in the pilot forums
Some of this Class A does happen to contain defined routes, some is just to protect approaches, missed approaches, sids, stars, etc.
The USA has more obvious "airways", usually VOR-VOR-VOR, but below 18000ft they are in Class E so not really relevant to a VFR pilot. France has a similar Class E route system between FL065 and FL120 (approx).
Flight planning software developers have historically had a hard time getting their heads around this stuff, and Jepp GPS databases still show what they think are 10nm wide routes in Class A but they show just the centreline (which is incredibly stupid).
What one needs to do it forget the whole concept of "airways" and just work on the actual CAS
shapes. It is the
shapes which you need to keep out of when flying OCAS, and if you are in CAS then ATC disregards any published routes anyway and tactically manages the traffic while keeping it within CAS.
I would be very suprised if the CAA maps were wrong. Much more likely, if indeed there is a discrepancy, somebody had incorrectly parsed some coordinate pairs.