What is another word meaning the same as in common or same?

There isn't a single word that perfectly captures the meaning of both "in common" and "same". However, depending on the context, here are some options:

For "in common":

* Shared: "They share a love of music."

* Mutual: "They have a mutual friend."

* Common: "They have a common interest in history."

* Alike: "Their personalities are alike."

* Similar: "Their experiences were similar."

For "same":

* Identical: "The twins look identical."

* Equal: "Their salaries are equal."

* Equivalent: "This medication is equivalent to the previous one."

* Alike: "The two paintings are alike in style."

* Similar: "They have similar hobbies."

For both "in common" and "same":

* Correspondent: "Their answers were correspondent."

* Concurring: "They are concurring on the matter."

* Consistent: "Their opinions were consistent."

* Coincidental: "They had coincidental experiences."

The best word will depend on the specific context and nuance you're trying to convey.