It’s not the same font at all. Just because they are all script fonts doesn’t mean they are the same. Many companies used script fonts. One of them isn’t even the same name (Durabil)
The test isn’t whether they use the exact same font. Maybe they are slightly different if examined closely enough. But the legal test is whether their brandings are sufficiently the same or similar enough that could risk customer confusion. And that answer is yes, as shown by the disagreements and pages of discussion whether they are the same company or different companies. That’s customer confusion.


