getting the right ecm for my car

Hi, i have an automatic 93 honda civic EX 4dr, that just wont start! and i think its either the distributor or the ecm. im looking into getting a new ecm and was wondering if anyone can tell me what all has to be the same. like can i put a 5-speed ecm on an automatic car? i had the engine replaced not to long ago and  they put in a 1.5 liter, but when im searching for parts for my car it ALWAYS says they originally have 1.6 liter engines in them. so since its got a smaller engine in it than it originally did, do you think its messing with the ecm? any input would be greatly appreciated!

-thanks

I would also check the low oil pressure switch - many of the older Hondas had them and if they go bad the car won't start.

I wouldn't think the .1 liter difference would prevent the car from running - it may not run in the most efficient manner, but it should still run.

So Velocity, if i had a bad ecm though, would it prevent the distributor from sparking, or should it spark no matter what? and if it turns out its the control module inside the distributor, would i be able to buy a new one? or would i have to replace the whole distributor?

thanks!