Pretty much all armalites produced in the airsoft world these days come from the original TM design, save for a few other brands who tried their own thing. In short, yes those mags should fit in your G&G. It should be noted that not all companies adhere to the exact some tolerances and fitment specs as TM so while these mags may fit and feed there maybe other issues such as being to tight or maybe a wobble.
A few drops of silicone oil down the shaft to lubricate the spring usually fixes most feed issues with KA armalite style magazines. In the past there have been other feeding issues that required some slight modifications like minor filing to make everything work properly. This is assuming that the magazines have any issues at all.
"Its only a little bit on fire"