N75 clarification

Can someone please clarify the apparent differences between N75 solenoids.

I have a 58 2.0TDi 140HP estate classed as PD8v in the logbook, BKD engine, with second time round overboost tubo dropout - very intermittent.

The first time in 2011, the N75 was replaced with part E6Q906625E, without curing the problem. Fortunately Skoda funded a new turbo as the fail was 7 days after warranty expiry!

Now,  when searching for a replacement N75, I'm seeing a lot of 0906627 parts with different prefixes and suffixes.

Is there anyone who can explain the differences and similarly the MAF and MAP suitable for my car. Unfortunately the nearest Skoda dealer is a 300 mile round trip away!