Like all or most Hondas, it is mostly luxury.
I don't have time to look for all the stuff now, but DX is the base model, LX is the middle model, EX is the top of the line. Here's a basic search
90-93 Autotrader says the DX and LX models had 125hp, the EX had 140hp.
94-95 I believe introduced the SOHC Vtec F22 on the EX. The DX and LX jumped to 130hp, the EX had 145hp, then there's also a V6 auto here somewhere.

Most of the number differences could only be changes in the way they rated the engines. Someone could shed some more light to this topic.