Eni - Wikipedia looks like the company it mentions. I don’t see anything about music there, but it looks like they’ve done a bunch of things in a bunch of fields, so maybe they were involved in music somehow too.
Does this sticker make it a different release or not? If it is a different release, I’m guessing the sticker info should just go in the disambiguation and annotation, since it’s too vague to know what relationship to add?
Eni has numerous petrol stations in Austria, but I don’t think they’re deeply involved in the music business - maybe sponsoring.
However, I would not create a new release because of a sticker.
If everything else matches, I think, you can use the existing release. There is a disc ID that you can compare to that of your first CD, but this disc ID was added a long time ago and does not necessarily belong to this release. If your disc ID is different, use your disc ID to set track lengths from it.