Yep, the guys behind the trenchcoat generals have a similar if not identical outfit with the Rebel Honor Guards, except they wear caps. And there were RHG at the entrance to the temple as well.
The two capped men behind the generals have actually uniqe uniforms and if you look closely you can see the substantial differences. The chap on the left there has an ascot, anda much more tailored costume on... I believe his uniform features noticeable buttons, and his cap's brim might be a little shorter...
The chap on the right has a less tailored uniform, and his ilk can be seen standing ahead of Fleet Troopers in some areas. I also have noted some color differences but they're fairly unnoticeable.
You can see in the long shot how the brims on the hats between the two uni styles vary a noticeable bit. There are also "logos" centered on some of the hats (for the untailored uniform), similar to those of the human crewmen aboard Home One... I have never been able to clearly identify the shape/design of the logo, and it's up in the air if the logo denotes the regiment/legion these individuals belong to, or their ship/fleet logo perhaps... ship/fleet logos are in the X-Wing games but they're much more akin to aquatic shapes and seem very Mon Calamari-ish in look.
I've always felt that, like the Empire, the uniform style may as much an indicator of rank/station as the various Imperial uniforms we see that don't show visible rank indication on them.
On the two uniforms you'll note the collars, belts, cut/style, and hats are distinctly different between the two though, and also the color is pretty clearly lighter on the "tailored" uniform whereas the untailored uniform is more a dark brown or greenish color.
The Rebel Honor Guard more closely matches the less tailored costume in color and uniform cut, however I am not home to dig through all my photos and books to compare either to see if the Honor Guards wear yet another unique style uniform.
Add to this then the unique "tech" uniforms (there are 2 distinct styles, one I have come to assume as the "chief" or officer in charge of the techs/mechanics and maintenance crews), Dodonna/Antilles uniforms, Fleet Trooper uniforms, and of course the Pilots, and that's a lot of variety really, but still a distinctly "uniform" culture indicating a large structured military body, which contradicts most EU interpretation of the Rebel Alliance save for source material, games and such.