J-Raz

Hi all im in a bit of a dilema - ive picked up a 2.8 surf injector pump of a bloke to replace my hilux 2.8 injector pump as i was told its a direct replacement...ive just pulled the hilux pump out and its slightly different to the surf pump?? The part numbers dont match either - hilux has 0.9 48 stamped on it and the surf has 0.9 50... Is it ok to use this pump or is it not suitable??? Cheers for any help