yes u can use a cosworth pump but can't confirm if it uprated or not but i'm pretty sure it is

when swapping the fuel pump also check the voltage your getting at the pump wires also if it's anything less than 13v replace your wiring with a relay setup with a fused live from battery and new earth wires also this way your pump should be getting over 14v all the time this can make a difference and not cause your engine to lean out at top-end (dependant on your engine setup)