You can open a show file saved from any flavor of ColorSource Console onto another variation of ColorSource Console. Show files will be compatible for AV vs non-AV as well as 20 vs 40.
Keep in mind that if you load a file that was originally saved on a 40-fader console onto a 20-fader console, you will lose any channels above 40, since the 20 variants support up to 40 channels. You will also lose Memories / Playbacks 21 - 40 on each of the 10 Playbacks pages.
Also, a non-AV console will not load the Audio or Image components of an AV showfile.