>>10693959they are all loosely connected timeline wise at this point(Red spectacles, the first movie, happens in 1989 or so, but Jin Roh, the third one takes place around the 60s although Red spectacles is gonna start in terms of hours or weeks at most after the end of Jin Roh) the closest to a canon timeline is in a manga and a databook, but this kind of done in purpose since the point is not the continuity but the stories themselves and the themes.
The relevant topic to this thread is that means theres more than one design for the armour, theres the designs used in each one of the three movies(theres 1:6 scales of all three of them and a revoltech of the first movie,), Kenrou densetsu manga design(kind of the closest to canon, theres a variant revoltech that does this design and a whole Takara line 1:6 that approaches to this design) then the variants in other shorter manga, and finally the Panzer jaeger design which Takeya did so now theres this thing coming out. Kerberos Panzer Jaeger(Kerberos The hounds of Steel) is a prequel no matter the way you approach the continuity because it shows the very first unit with a type of protect gear at the end of WWII after Hitler was killed and theres this woman photographer who wants to investigate them.
The protect Gear´s designs are generally made by Yutaka Izubuchi, but manga artist have liberty to do their touches