Omega B 2.5 TD injection pump from BMW?

I would like to change the injection pump at my Omega B 2.5 TD because the old leak is. I have now come across an offer: Injection pump from the BMW 325 TDS E39-shall fit according to the supplier also at Omega???Is that really at that?I mean…that doesn’t seem quite absurd to me now, since the engine itself is also a BMW engine…just with a different head,so also bit less power than the old 525 TDS.