Do you have an invoice for the dual mass flywheel? Does it say which brand the DMF is? Or do you have a the packaging, maybe there is a sticker with the manufacturer and some additional infos on it. Or maybe you'll got an install instruction with it. Normally a DMF doesn't come without packaging and installation instructions.
For example if it is a LUK DMF the right DMF would be a 415 0072 10, whereas the wrong would be a 415 0120 10
Did you buy it from a Porsche dealer, or after market?
Do you have access to a OBD2 diagnosis, or a Durametric diagnosis? I would be interested in up to date error codes.