Sure, they´re not hard to ID from their weathering. From front to back: Triangles, TIE killer and MOM Y. The first pic you posted doesn´t show an ILM Y, just look at how off the canopy is, I always assumed this picture shows the old 1/72 Argonauts kit?
What I´d like to know is, where´s the Y with the copper piping and yellow panel on the nose?
You're right, that third Y-Wing does match the MOM Y, and the Y-Wing next to triangles in the shot of 4 X-Wings and the 2 Y-Wings. I heard MOM was an unused pyro from ANH that was pulled out and finished for ESB, and so I was assuming that the weathering was applied later but these two pics show that it was pretty well finished during ANH and just needed some nose canons.
The MOM is also mounted on a stand in that pic, so it apparently had an armature early on. This seems consistent with the idea that Red 3, Red 12, and Red 4 were all pyros that were blown up, but they obviously had armatures from their reference pics, and that triangles was demoed. Looking at the picture of triangles above being rigged with explosives, although I don't see the explosives in the pic, I see triangles is mounted upside down without a droid, ion canons, butt panel or the engine exhaust nozzles. Since TIE Killer, blue/gray, red jammer and MOM have all been on display or had more recent photos of them, they all appeared to survive which means there were at least 2 other pyro Y-Wings built.
The Y-Wing with the yellow panel is labeled as Gold 5 over at MM&M by Kuhn Global and is the blue/gray model:
Gold 5 Studio Model
I've identified blue/gray as being next to TIE Killer when seen from inside Gold Leader's cockpit and again in the trench run next to TIE Killer. The yellow panel and lack of engine stripes gives it away.
The picture that is probably a commercial Y-Wing kit is being passed off by Kuhn Global on MM&M as TIE Killer, labeled Gold Leader on that site, next to two pics of TIE KIller.
Gold Leader Studio Model
The table of models is an interesting set of photos as there are MOM, TIE Killer and triangles Y-Wings present along with Red 6, Red 12, Red 4, Red Leader pyro, Red 5 hero, Red Leader hero, Red 2 pyro, and Red 3 pyro. Both Red Jammer and Blue Leader/Red 2 hero were missing, but likely in the UK at the time of the pic being referenced for the full size set pieces. But also missing are blue/gray Y-Wing and Red 3 hero, plus any later pyros. I'm not sure what the absent models indicates?
Another site that someone referenced is:
http://www.jbot.ca/starwars/ds1/DandH.htm
There seem to be several errors on this page or known identified items omitted. There are several Y-Wings and an attempt at designating which is:
Gold Leader - picture of TIE Killer from side in space
Gold 2 - a picture of Red Jammer imposed over the trench wall
Gold 3 - appears to be blue/gray in a reverse image in space
Gold 4 - might be MOM viewed from the bottom
Gold 5 - might be a pic of TIE Killer in the trench with gold markings bleached out
Gold 6 - unrecognizable rear view of a Y-Wing
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