Help compatibility

Hello, I have a left-over Eisstation 40 DC-LT Solo Top which came with 90-degree 11/8mm fittings that look different to these:
1728377730124.png
The ones that came with the Eisstation 40 DC-LT Solo Top, instead look like the one on the right of this image, where they are shown side-by-side:
1728377837591.png
I noticed that the retail one (left), has copper inside, but the one that came with the Eisstation 40 DC-LT Solo Top looks painted on the inside, a part of it is scratched and looks like brass, but then it appears to have some kind of aluminum ring inside?
Can anybody tell me if I can use these two in the same loop. Can anybody at Alphacool please tell me with certainty what these fittings that came with the Eisstation 40 DCLT Solo-Top are made of?
The photo below appears to suggest this part is made of brass.
1728378235212.png
However, it looks gray from the other side. It appears to have some type of useless aluminum lock washer. I dont know what that is.
1728378311755.png
Can anybody help me out?

Thank you,
-BobbyBoyGaming
 
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