There is a way in the vin to tell the dif. but I forgot it. SH does have atts. SHs have 5 spoke better looking rims vs. base has the curved saw blade looking rims. SHs come with paint-matching lower trim/lips vs. base has black trim that is shorter. SHs are all 5spd. I think SHs come with factory spoiler, but you can get it as a factory option on the base. I think the interiors are the same on both, engine is the exact same on both, transmission is the same (if both are 5spd). Theres some more im sure, but those are the major differences. Mainly a few cosmetics and atts are the only major differences.
BTW, if you get the base, get a 5spd. The auto trannies are known to live short lives.