If the cars are different, it can be said we know some of these cars make up the remaining 48 cars:
GROUP N - N100 (2)
Mazda Roadster S (ND)
Toyota SF-R
GROUP N - N200 (4)
Alfa Romeo 4c Launch Edition + Gr.B(?)
Peugeot 208 GTi + Gr.4
Toyota GT-86 + Gr.4
Volkswagen Golf VII GTI + Gr.4
GROUP N - N300 (5)
Audi TTS Coupe + Gr.4, Gr.B(?)
Ford Focus ST + Gr.4
Lotus Evora + Gr.4, Gr.B(?)
Mitsubishi Lancer Evo X Final Edition
Subaru WRX STI Type S
GROUP N - N400 (6)
Aston Martin V8 Vantage S + Gr.4, Gr.B(?)
BMW M4 Coupe + Gr.4, Gr.B(?)
Ford Mustang GT Premium Fastback
Lexus RC-F + Gr.3
Mercedes Benz A45 AMG 4MATIC '13 + Gr.4, Gr.B(?)
Toyota S-FR Racing Concept
GROUP N - Safety (2)
Mercedes-Benz Mercedes-AMG GT S Safety Car
BMW M4 Coupe Safety Car
GROUP N - Unknown Sub-Group (14)
Alfa Romeo Mito 1.4 T Sport + Gr.4, Gr.B(?)
Aston Martin One-77
Chevrolet Corvette Stingray
Chevrolet Camaro SS '16 + Gr.4, Gr.3, Gr.B(?)
Dodge Charger SRT Hellcat + Gr.4
Ferrari LaFerrari
Honda NSX '17 + Gr.4, Gr.3
Jaguar F-Type R Coupe + Gr.4
Lamborghini Veneno
McLaren 650S + Gr.4
Mercedes-Benz Mercedes-AMG GT S + Gr.4
Nissan GTR 2012 + Gr.4
Nissan GTR 2017 + Gr.4
Renault Sport Megane R.S. + Gr.4, Gr.B(?)
A possible 28 cars can make up the remaining 48. If we add each car as different model the way PD has done.