Does anyone know if I can swap the rear sight from an RRA A2 Match handle onto the RRA Stand Alone sight ?

And vice versa

you should be able to ,

been a while since I have looked at a factory RRA match sight, it may have the extra spring and detent to keep the base straight (one on each side, vs the one on a standard sight)

if so,, you can drill the stand alone , or just not install that extra spring and detent

AFAIK all the parts are interchaengeable so there shouldn't be any issues.

We will know officially in a few days. I have ordered the special install tool. Although I believe a swap could be made with one or two extra hands. I already have most the AR tools in the world.

Match and standard sights swap easily.
With a little creativity I didn't even need the special spring compress tool.
Had to shorten the stem on the match sight some to work in the RRA stand alone sight. Was easy.

Now I am going to sell the A2 lower with an extra NM upper. All RRA.