Header, Intake, & Exhaust - header for a b18c1

alrite i know theres a few of you with this swap in your ek's so heres my question.

it was my understanding that if i get any header made for a ek civic with a b series motor, it will work with a b18 and a b16. is this correct?

and it will still bolt up to a cat correctly, right?

why wouldn't you want to get an engine specific header? they are made for specific engines to produce the most power...