I guess part numbers are how you'd find out for sure if they were 100% identical.
As for it handling extra power, from what I've read the DSG box seems to be able to cope with a stage 1 tune far better than the manual. With manuals you read a lot of about clutch slip after stage 1 is applied.
That's only a strictly amateur opinion btw, based on reading this and other forums a lot over the last few years.