No much difference at all on the 92 and 97 ( except lights but hard to see ), the interior on the 97 some had piping ( mine did ) and the wheels in 97 there was the optional BBS and the Brembo brakes ( again optional ). Wheel size, HP
The BIG difference will be if it is a 850 CSI instead of a 850 CI or 850 CIA.
The easy way to tell the difference is the Price tag ( 50K+ )
The CSI had wider body, wheels, an M engine amongst few.
Again, I don't know if you are going to use it as a casual driver, but the clutch tends to be a PITA if in slow traffic ( hard clutch like 911T, Lambos, Ferrari etc ).
I loved, ABSOLUTELY loved my automatic, and playing with the gears is just as fun.
89-94
Engine : V 12
Engine Code : M70 B50
Fuel : Petrol
Fuel System : Bosch Motronic Fuel Injection
Engine Alignment : Longitudinal
Drive : RWD
Displacement : 4988 cm3
Bore x Stroke : 84 x 75 mm
Type : 24 Valves
Aspiration : N/A
Compression Ratio : 8.8
Output : 300 cv (220 kW) @ 5200 rpm
Torque : 450 Nm (331 lb.ft) @ 4100 rpm
Gearbox : 6 speed Manual
Wheelbase : 268.4 cm
Length : 478 cm
Width : 186 cm
Height : 134 cm
Cx : 0.29
Front Brakes : Vented Discs (324 mm)
Rear Brakes : Discs (324 mm)
Front Tyres : 235/50 R16
Rear Tyres : 235/50 R16
Kerb Weight : 1790 kg
Weight/Output Ratio : 5.97 kg/cv
Front Suspension : Double pivot spring struts
Rear Suspension : Multi-dimension wheel suspension with five control arms
Top Speed : 250 km/h (155 Mph)
0 to 100 km/h : 6.8 s
0 to 400m (1/4 mile) : s
0 to 1000m : 26.3 s
Fuel Consumption* : 8.8L / 10.4L / 19.8L / -L
Range : km
Fuel Tank : 90 L
Trunk : 320 L
CO2 emissions : g/Km
94-97
Engine : V 12
Engine Code : M73 B54
Fuel : Petrol
Fuel System : Bosch DME inj.
Engine Alignment : Longitudinal
Drive : RWD
Displacement : 5379 cm3
Bore x Stroke : 85 x 79 mm
Type : 24 Valves
Aspiration : N/A
Compression Ratio : 10
Output : 326 cv (239 kW) @ 5000 rpm
Torque : 490 Nm (361 lb.ft) @ 3900 rpm
Gearbox : 5 speed Auto
Wheelbase : 268.4 cm
Length : 478 cm
Width : 185.5 cm
Height : 134 cm
Cx : 0.29
Front Brakes : Vented Discs (324 mm)
Rear Brakes : Discs (324 mm)
Front Tyres : 235/45 R17
Rear Tyres : 235/45 R17
Kerb Weight : 1955 kg
Weight/Output Ratio : 6.0 kg/cv
Front Suspension : Double pivot spring struts
Rear Suspension : Multi-dimension wheel suspension with five control arms
Top Speed : 250 km/h (155 Mph)
0 to 100 km/h : 6.3 s
0 to 400m (1/4 mile) : - s
0 to 1000m : 26.1 s
Fuel Consumption* : 8.4L / 10.1L / 17L / 14L (16 mpg)
Range : 642 km
Fuel Tank : 90 L
Trunk : 320 L
CO2 emissions : 326 g/Km
Hope this helps and sorry for the lenghty message