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I would think that while the GUI's look and feel is different from vendor to vendor, they probably don't change the GUI's logic too much, so that you should be able to find your way around it (speaking from experience with Red Hat). The CLI is not branded afaik.

In short, I would not be worried about these things.

One caveat: Red Hat's exam description makes it clear that they use their deployment and management tool Director. While it is based on Triple-O, it's not quite the same. Besides, the exam currently uses Liberty, and Liberty Tripleo seems to have become unavailable. So, if you go for Red Hat, you need to know this. I don't know about the other vendors.