i was wonder if my 91 si engine and tranny will go in to my 90 dx

my 90 dx is a auto and convered to a 5spd and i was wondering does a 90 dx is a efi or carb bec i bough this car with no motor or tranny and i looked at the wire hardness and the ecu they look the same for the si so i was wondering will it work that way?