I guess what I had in mind originally was physically different models of the same console. Like for the Wii, I would say there is only one model, even though internally they have made different motherboard versions to make installing mod chips more difficult.

Also I guess there was:

Atari Heavy 6
Atari 6 Switch
Atari 4 Switch
Atari Vader
Atari Jr.

I know there are a couple of juniors (short label, long label).