Humm.
I haven't looked at the differences.
It does seem to good to be true. And usually in that case....

Update: I picked up 4 30v ECUs at the junkyard yesterday, two 3B0907551CGs, a 3B0907551AN, and a 3B0907551BS. There was a single '00 A6 2.7T in the yard but someone had snagged the ECU already. The AN box was the only one without an immo, but I flashed a clean 95040 to all of them and systematically tested each on both S4s (one stg 2+ '01 and one full stg 3 '02) and...

Not a single problem with *ANY* (EGTs deleted) file on either car! No misfires, no CELs, no EPC lights, no troubles. However, any files with EGTs trigger limp mode and set 17866, 17867 DTCs once the coolant gets to temp.

So, if you are using EGTs in your particular setup/tune, you won't be able to use the 30v DBW ECUs. This is the only definitive answer I've come to, though it's looking more and more like the rest of us can use these cheap and plentiful ECUs.

I'm going to continue exploring this development. If you want data or logs or anything, just ask.

Well I did some tests today and it's not looking good.
No codes present at all.
No misfires
Smooth idle and drive

However the n75 control was the issue.
It went from 0.0% to 95%
There was no smooth tradition. Just a massive jump.
The boost would not keep up with specified.
It would boost but it was way off and it was obviously down to the issues with
controlling the n75.

Once I noticed that I stopped and pretty much placed this idea in the dead pile.
The ECU will work in a pinch if you are stuck or stranded.
but not reliable for anything other than that.
DD you are again, correct.

We should never doubt you....

I'll post my logs tomorrow. I've had zero issues with the N75 duty cycle 

Actually, here's one from my stg 3 car from last Sunday after I adjusted the wastegates back down to 9 psi. Just a quick up the road and back.