The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
@ss_rakesh I did two folders as you suggested with the same content. Placed them in FAF Client Map folder (you can find it from FAF client top left) It works perfectly. I don't have the path you suggested,, but placing them where all the other FAF Client maps are, it works and no visual glitches.