Me thinks:

Anything original to the rifle, I wouldn't reblue. I would clean and oil. Added parts that are not original, I see it as a bit different (I wonder if the front sight was a part missing, that you found to properly complete the rifle?).

If I refurb a LE N01Mk3, and the Drill Purpose nose cap I got from Springfield or Numrich doesn't match the blue of the barrel and receiver, I will work on it and make it match better. But I wouldn't reblue the barrel to match the nose cap.

If there's rust somewhere, I will remove the rust; based on the argument that this damage can get worse. Then I am still debating if reblueing the damaged part is better than not doing it...

I did recently reblue a 1952, Polish Mosin-Nagant M44. I decided to do it because the blue had been previously removed with steel wool relatively recently - that's different than blue getting worn off from use over a long period of time (but that's just my opinion...)

Lou