Heater switch assembly differences?

[The70RT]

There are several different numbers for these type of switches that look identical, so what's the difference? I have an nos one but number comes up for a Challenger. I have a couple used ones that came from Chargers but both have different numbers too. I also got some new aftermarket ones but boxes show they are for C bodys 

[Nacho-RT74]

Dunno Heater, but A/C... I know some are supersedes numbers, some others could get some internal differences due some kind of delay timer circuit some cars got, some others not. That make the internal electrical plates what makes contact to close circuits can be diff.

But dunno certainly