Well, not really. They seem to be identical and I did not see a picture showing the differences. The only thing you mention in your post is..
And you quote this carving to the DanishHome Guard. Wouldn't they though mark all of their rifles with their own markings and not only 40 for the Sirius Dog Sled Patrol? Secondly, I'm having a bit of a tough time to imagine the Danish Home Guard hand carving a scripted HJV to the stock rather than to take a stamp or whatever was at hand and apply it to whatever they were happy to stamp upon.
If there was any other detail you had pointed out and I overread, please point it out to me. Just trying to learn. I don't doubt your rifle being one of those, I'm just trying to learn based on what one could tell the difference between a former RGTC and a Sirius rifle since to my understanding they were in identical configuration. Thanks!