The '70 mirrors are just 1970-'76 A-body sport mirrors with different pedestals (bases). The A-body mirrors mount atop the "flat" area of the door, so the contour and width of the base is different. Chrysler hardly went "all in"--it was typical of Mopar to share as much tooling as possible with an existing line. The base is the inexpensive part.
The '71-'74 mirrors are identical to the '71-'72 B-body mirrors; the '73-'74 B-body mirrors have a taller pedestal/base to improve rearward visibility over the Chargers' "hips" but the glass and housing itself are the same. The taller pedestal also has different screw spacing, with the screws closer to the ends.
In '75, the B-bodies lost their hips. As a result,
those mirrors have the short (E-body) height pedestal with the '73-'74 screw spacing. I
think (but can't swear to it) that it was 1977 when the B-body (and now F/M-body) mirrors changed bases
again. Once again 'twas the short pedestal, however it has no exposed mounting hardware. There are studs screwed into the mirror bases which fit through holes in the door and an internal door bracket. The whole shebang got fastened with double-thick captive-washer nuts.
Through it all, the heads never changed. Later cars used convex glass ("
OBJECTS IN MIRROR ARE SLOWER THAN THEY APPEAR") on the RH mirror, which also gained a remote. The joystick was placed low in the dash not far from the ashtray but again, I'm not sure on which happened in what year. The mirrors were still available either chrome or painted through the bitter end in '81; the last cars to have them as an option were the '81 M-body coupes.
Because of the hidden fasteners, the '77-up mirrors are a subtle "smooth look" modification for E and the '71-'74 B-bodies that few notice (unless it's a restoration), especially if you hide the RH remote behind the dash. I probably don't need to tell anyone how nice that convex glass is if you actually plan to drive your car, and all these mirrors should've been dual remote from Day One.
I can't recall for sure if my '77 Cordoba had hidden fasteners or convex glass, but it was definitely a remote RH and they were chrome. My friend's '78 Magnum had chrome dual remotes with convex RH glass and stud mounts, same as my '81 LeBaron coupe; I had painted versions of those on my '79 300 and '80 Aspen. My '73 Charger had a '75-style mirror on the driver's door (chrome remote, short base & wide screw spacing) and the original tall-base '73 non-remote, non-convex RH mirror. The RH mirror being about an inch taller than the LH looked rather stupid when viewing from the front, which is when and
why I really started paying attention to exterior mirrors.