Is SG Junior a lesser version of the SG Special?

Comparing these two classic guitar models from Gibson. At first glance it might seem that they are almost identical guitars, but there are pretty clear tonal differences and they feel different to play too.

Gear used:
Gibson SG Special
Gibson SG Junior
Marshall 1987x 50 W plexi reissue
Marshall 1960ax 4x12" cab

Parts:
0:00 Intro
0:25 Spec differences
1:35 Playing the Junior
2:25 Playing the Special
3:00 Analyzing the differences
3:55 Playing the Special again
6:18 Playing the Junior again
6:48 Further analysis of the differences in tone
8:19 Junior with the tone pot rolled down
9:34 Special with the tone pot rolled down
11:43 Clean tone with the Special
12:26 Clean tone with the Junior
13:42 Final thoughts