97 civic ex tranny to a 98 civic hx

[Skateallday92]

Hey guys I was just wandering if I can swap a automatic tranny from a 97 civic ex to a 98 civic hx coupe? Please help!!! I was told by a mechanic that I need a different wiring harness?
thanks
-jarred

 

[Trekk]

Is it the CVT?