The universelle is still a good product but the formulation uses lower quality ingredients as it is part of the regular line up (not the gold medal line). I wouldn’t skimp on products when it comes to a pricy bag like Delvaux. (At least in my opinion!)
They specifically mention box under the intended uses for the Napa cream.
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The mink oil in renovateur isn’t present in the nappa / macadamia / reptile formulations either so I’d feel more confident using those in order to prevent any alterations in the finish of your leathers. The renovateur is still a good product I’ve just not personally had great experiences with it…