I assume you are looking at a LWB.
The most commonly found Gen2 Pajeros are the following:
All diesels have the 2.8tdi motor. Very renown for cracking heads in the Colts, but very reliable and loved in the Pajeros.
The petrol motor before about 1996 is the 3.0V6 12valve. From 1996 - 1998 is the Gen2 3.5V6 twincam 24valve motors. From 1998 - 2000 is the Gen2.5 "Blister Fender" with the same 3.5V6 twincam motor.
As mentioned, the sparkplugs are hidden behind the manifold. BUT todays sparkplugs can last forever. My car is now 80 000km old and still on the original plugs. Those twincam motors also tend to have noisy lifters ("tappets"), but can mostly be cured with the correct engine oil.
Some models have difflock and some not. My '94 didn't and then the '98 had difflock, cruise control and the front seats had their own suspension.
All those Pajeros were wonderful cars and if you can find a nice one you will really enjoy the experience.
Still missing my 3.8V6 Pajero