Changes between MegaTrav/TNE star types and Traveller Map


In my noodling around, debating a new Traveller campaign, I looked up some of the systems I used in my old Deneb sector game and in one case (Gampin) I noticed that the binary system now consisted of two G class stars, whereas in my copy of Regency Sourcebook (and MegaTraveller Journal 3 iirc) it's a G and an M.

Was there a bit of "tidying up" between editions and is there some sort of changelog somewhere? :)

In the grand scheme of things, it doesn't matter, I am probably the only person to notice the change to Gampin or care but I'm curious. :)