IIIRC, the '92-'94 injectors have a higher impedance than the '89-'91's, so your ecu wont be able to fire them. Other than that it should be they should be the same, but you would be better off leaving the '89 harness on it, and sending out the '89's injectors to be cleaned and balanced and used with the '93 block.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed