Somebody asked diffirence between L1 and L6 ECU. They can be chanced together w.o. any problems. Only reallife problem with L1 is it can melt its earthwires inside of ECU. And other one is C0% adjust -potentiometer in ECU; it`s too small in movement-> can "wear" easily and can loose its setting, specially in well used ECUs. In here Ford importer chanced (in warranty terms) L6 for many threedoors due mentioned problems.
Sorry for bad english; too old person to learn anything...