hmm. not sure if this would work or not, due to the way the cordia system works..... you would probably want to look deeper into the way the standard system works. and even then if you can get it to work, i wouldn't be driving it hard!
if it can be done you would want to match the injector impedences, kinda like you mentioned above.
eg. if the cordia injectors are 8ohm, and the new injectors are 4 ohm, then yes, you would wire 2 of them in series for each injector output. if the new ones are 16ohm, then you would wire them in parallel.
you may be able to use the appropriate resistors to get the right impedence also.
the other thing you would need to match is the injector size i would think. cordia's are around 800cc, so you would need to run 400cc or else your not gonna get the correct mixture.