3.0d, EGR Pressure Converter? Or what the...?

[alexxxa]

Okay, so I know there aren't many diesel tractors among you guys, but I will try though.

Anyhow, I'm still in the process of working on my E53 3.0d (M57, 2006) and I got a few times 4501 fault code (Exhaust-gas recirculation control, control deviation). Luckily, still no problems in driving (or not that I can notice).
But I had a similar code on my E46 (M47 engine) along with few others and replacing the EGR pressure converter (#11747796634) resolved the problem.
I was thinking of doing the same here on my tractor (also as a precaution, since these old valves do die) but I got lost in the process.

So, where the hell is the EGR pressure converter located and how many of them are there?
If I followed the vacuum hose from EGR correctly, I stumbled upon some other thing, that RealOEM calls Electr.valve (#11747810831). I thought this is used to control swirl flaps and that it is attached to the intake manifold. Maybe I'm wrong? I couldn't find the "other converter."

But now I know nothing, google and youtube don't help much, so I came here to ask for advice:

Which one of these suckers is the right EGR pressure converter, and where should it be located? And what is the other one for then?

#11747796634 (https://www.realoem.com/bmw/enUS/sho...36#11747796634)

or
#11747810831 (https://www.realoem.com/bmw/enUS/sho...77#11747810831)


P.S. It is not impossible that the previous owner (or owners) replaced the 11747796634 with 11747810831 (if that's possible at all), since some douchebag owned the car at some point and did terrible maintenance.
Any ideas?