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Ray since no one else has answered you
My understanding is that, no, you can't tell what revision of the bearing assembly your car has if it is a replacement engine until you pull the transmission and clutch off. '02 replacement engines may be redone '97-'01 engines or redone '02 engines and '02 was around the time they switched from dual to single row bearings.
There are no comparative statistics on which of the 3 assembly designs are more prone to failure except in Porsche's records and they aren't telling.
So yes, you have to possibility of a failure of the IMS.
Now the good news is they don't all fail and the failures are spread out over many possible years of ownership.
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