No its the relationship with the ecu and the immobiliser, its hard wired in on the 32v ecu, so you either need to change the chips on the ecu or use a third parrty. With the 40v cars have they newer ecu where its all done in software, so can be reporgrammed.
In the photos above the first is actually Andy Hills which is a manual not tiptronic and is the six speed 01X/E box.
As long as the gearbox is from a 5 cylinder or 6 cylinder audi it will bolt onto the V8 engine block. The best box is the 01e or 01x which is a six speed but the 5 speed box will do fine too.
IIRC In the UK all Audi V8's were quattro auto's, in europe there was the occasional V8 quattro manual but are very rare.
I'ma couple of weeks away from making my own flywheel as the 034mototsport one is expensive and thay also have ring gear supply problems