lots of guessing, here.
the 24 had the AUDI 100 2.0 engine, the blown version was the same engine. The 44 has many more Porsche bits than the 24, which is a parts-bin potch of 1302S, Type 3, AUDI 100 and Golf bits. You need a mate with with the microfiches so you can spot the VAG bits if you are not familiar with them. agree with above, the Quattro motor suits the 24 beautifully, even the plain 2.2 5cyl is a step up in torque and sounds better than stock.
What would we consider an "early" 12, since they were made for such a short time? (I do like 912s, though).