Well I am pretty sure that none of the under dash / engine harness to chassis harness plugs are going to plug in so you will most likely neet to do some rewiring to at least get the instumentation to work. To be 100% honest, I dont know much at all about what all is going to be involved with doing this swap. I am sure that there is going to be a bunch of little nit-picky stuff that will be involved. Either way though, it can be done.
About the drive-by-wire, it might be easier to get the gas pedal assembly form the VVTI car and adapt it into yours and keep the drive-by-wire. It might even bolt right in being that as for as I know, there were no chassis changes between pre and post VVTI change-over, but it will have to be wired though, but if it is like most other drive-by-wire systems, it should only be 3 wires between the pedal and ECU.