E36 318is Motorsport differences

Hey Guys, I'm Bonez (I'm new here).

I want to buy a Motorsport 318is, however, I do not know much about these cars.

What are the differences between the Motorsport I and the Motorsport II?
Also, do some Motorsport I's come with no boot spoiler? I have seen a car I like on gumtree, he says it is an original motorsport I, but it does not have a bootspoiler?
Is there any way to tell if it is a true motorsport, or just a look-alike? It does have the M44 motor.

Thanks,
Bonez