I'm not an engine swap expert but I am a Motronic fuel injection/control system junkie. As such, I can't say that I have a PST2 (wish I did!), but here is a reference (of many that can be found on the interwebs) about swapping the 2.7 and 3.2 with DME 7.2. If this info is incorrect, I apologize.
You can swap in any replacement engine of the same displacement from 2000-02 without having to remap the DME. (for example, a 2001 3.2L Boxster with a blown motor can accept a 2002 3.2L engine with no remapping needed).
Go to this link, then scroll down to "Boxster 2001 (2.7L & 3.2 S)";
Pelican Technical Article: Boxster Engine Conversion Project - 986 Boxster (1997-04) - 987 Boxster (2005-08)