if there is, a single word, that is more professional and used on academic work or everywhere else where good English is written with proper grammar.
E.g. They got one thing in common.
E.g. They have one common shared foundation.
I am not sure I am conveying my message in a way that matters. Thanks.
They have one thing in common—the user experience.
Edit: There's absolutely nothing wrong with the last example I added, grammatically speaking.