only you can answer that by carrying out some continuity testing, the ECU will power the fuel pump relay from pin 28, this should connect to your new loom and supply the trigger for it.

Either that or leave the old relay as it is, and use the old fuel pump feed to trigger the relay.

Get a multimeter on the job, does the relay you are holding have a trigger with contnuity to pin 28?, and continuity to the fuel pump via the main live output? if so thats the fuel pump relay.