I cant tell you the exact differences between the 2 computers, but I can tell you this.. I did the zc swap, and I ran my si ecu for about a month, because my integra ecu had not come in yet.. the si ecu will run the zc just fine, but the integra one will really make a difference! I think the integra runs a bit richer on the fuel side, but it just seems to wake the zc up alot more, then when I was running the si ecu.
again, nothing technical, just my .02 cents from having been there, done that.
later
Sneak