Camshaft Part Numbers > Connection ??

Hey, guys.

I'm about to swap my 4.2er's heads. Because the first endoscopy allowed already devastating judgments on the condition, I decided to buy in the meantime a few used heads with manageable mileage and to clean the thoroughly, use new shaft seals etc..

The whole thing would have been culminated in a quick remodeling of old against overwork, but then I looked more closely and compared the TN of the camshafts:

4.2 #93:

Left

One: 101 BL Süko
From: 102 C Audi

Right

A 021 AR Süko
From 129 GJ Audi

4.2 #94

Left

A 101 BL Süko
From 102 C Audi

Right

A 101 BK Süko
From 102 AA Süko

Weird, isn't it?

The 94 is the donor, now I wonder, of course, how much you can exchange it crosswise without any problems. Even if they don't seem to differ significantly, camshafts would just be like that, so what perspective do I have with the stuff?

Has anyone ever dealt with the constantly changing TNs and their connection over the years and can tell me something about them? What do I have to expect? Low power differences, changing other components... ECUs?

I'm grateful for every tip, maybe somebody's got a idea?

Greetings.

Flo