The Zoom 763 does look eerily similar to Zip - way more so than TUI!
FYI, TUI is actually one of the world's largest, if not the largest, tourism company in the world, owning nearly 3700 travel agencies in Europe. TUI is German-based, I think. It has up to about 88 aircraft and has taken over several European airlines, which explains why Britannia, Hapag-Lloyd Flug and a few others now have that same blue c/s. It's not as well known outside Europe.
Here's a pic of a 767 in TUI colors:
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Photo © Jonathan Simmons
But I think the Zoom color scheme looks more like Zip's.