You have the basics, 02M is also a quattro trans.
2 good references for transmission codes, ratios, and cruising speed
02A and 02J are the same case. 02A transmissions can be a little confusing though, because they came with 2 different size axle cups.
02A also has a sloppy shifter. Easily fixed by installing shift box and shift tower from an 02J.
VR6 and 4 cylinder engines have different bolt patterns.