1uz 3uz vvti conversion ls400

Hi, So i've been running a 1UZ VVTi in my offroader for the last few years, but i've killed the motor (sump got dented up which blocked oil pickup) I'm wondering if i can replace it with a 3uz but retain the wiring harness/ECU etc from the 1UZ (i've only recently bought a new ECU for it from...