There were actually two Schuppan models, the 962LM and the 962CR. The LM came first, and was basically all of the parts of an early Porsche 962 built around Schuppan's own carbon chassis, with Porsche-supplied 962 long-tail bodywork and a water-cooled Porsche 2.65-litre DOHC race engine. There were more or less four of these, the first prototype used a Porsche chassis but was destroyed during testing, the two production cars now both wear replica Rothmans liveries (and the Japanese owner of one pretends it's a real Le Mans 962), then the final car was built by another company from spare parts when Schuppan got into financial difficulties, but never made road-legal.
The second Schuppan, the CR, had their own bespoke bodywork that took more influence from the 959, a wider passenger cell for comfort, and an air-cooled 3.4-litre SOHC supplied by Andial, which was road-derived, torquier, and more reliable. There were four CRs too, with the last one road-registered as late as 2006 after 13 years in storage. A fifth chassis was manufactured but was never used for a car, and more recently was used to rebuild the Andretti-raced 1991 Porsche that donated its original chassis to a Dauer road car.
The car in FH5 is the 962LM that was built from spare parts, which had a remaining CR rear bumper and a CR wing fibreglassed onto the Porsche bodywork. Stories differ on why, either to try to attract Porsche interest in creating a GT1-legal car from it as it wasn't entirely Group C bodywork any more (they backed Dauer instead), or to try to sell it to a buyer who had ordered a CR (who didn't take it either way). Where it gets confusing is that the current owner of this car claims it's a CR, despite using an LM chassis, bodywork, and probably engine, so when Playground have recreated it they've used the general 962CR specs that can be found online along with a model of that specific car, resulting in an LM that drives like a CR.
All of that is a very long way of saying that, while there were two Schuppan models, the one in FH5 is a mishmash of both, so if they added a second one it would either look like or drive like the one that's already in!
