should work just fine. it might not be as fuel effecient as the CX ECU not that you would notice the 2-3 MPG difference if that. P06 will work with CX engine both are non-VTEC.
got one (i think) i have a 92 cx and i did a motor swap and it was a 5 speed and i have the old ecu so if u havent found one let me know