[MA70-3.0GT]

IMO you'd find it easier for the moment cutting the injectors off the old loom leaving plenty length in the wires & fitting small spade terminals (or splicing to the loom, but I'd say leave the correct loom intact for now) so you can plug them into the connectors on the proper loom.

I can't honestly say what would do what without looking at diagrams for both but I'd suggest you'd have problems with starter circuit, gear position indicator & possibly ABS/cruise etc as well by using the wrong loom. For how easy it is to cut the wires out the old loom I'm surprised you went to the bother of swapping looms over really, are the plugs really well glued on too? Sometimes gentle persuasion with a small screwdriver can get shot of superglue (bet they were glued 'cause he snapped all the clips off removing them incorrectly one time & wasn't inventive enough to string a bungee over the tops to hold them on!)

Anyway stick with the proper loom & avoid the problems you'd cause yourself for the sake of some goon, use the spade connector method & when you get new injectors it's just plug'n'play.