This is my attempt at translating the sentence "Both of their faces look the same":
Does it make sense or is it completely wrong?
Japanese Language Stack Exchange is a question and answer site for students, teachers, and linguists wanting to discuss the finer points of the Japanese language. It only takes a minute to sign up.Sign up to join this community
is a perfectly natural way to say this.
There is also the idiomatic expression 瓜二つ for "look (completely) alike"
(or variations on this, like 「二人は瓜二つの顔をしている」「二人の顔は瓜二つだ」.)