Here is a post about the plugs:
http://www.sr20forum.com/sr20ve-sr16ve/88675-runs.html
The short of it is that you can adjust the plug to allow an earlier injector plug to fit, and the other plug is pretty common on the earlier harnesses also. The only difference is that the non-VVL plugs don't match the color. If you have a spare harness, you should be able to make them work w/o any problems - I think I just went to the junkyard an cut a couple plugs off. I'm not using actual VVL plugs on my car, and it is just fine.
Josh