69 Norton Commando timing cover

Hi I have a 69 Fastback that I am restoring The timing cover has part number 25186 stamped on it I am concerned that this may be an Atlas timing cover part number 25187 ?. They look identical but I understand you cannot use an Atlas Timing cover on a Commando. Any insights on this would be appreciated

Dyno Dave thanks for the reply It is stamped AB 1 and the holes line up with the timing side case Thx looks like I have the right cover