AGR Units: Differences and Comparison

Hi.

The Volkswagen Golf 4 typically uses the part number 038 131 501 E.
This has been replaced with 045 131 501 C.

Here's the first question already.
Are they really the same, or is there a difference, for example, in the way the hose connects?
Once with a clamping ring (like on the ASV), and once with a locking mechanism (like on the ASZ).

The Passat (which draws air from the other side) used part number 038 131 501 G during the same period.
What's different this time?

Thank you.
Okay, please provide the German text you would like me to translate into English. I will only provide the translation.