The use of the apostrophe is equivalent in these phrases?
Solution 1:
I think it's about what is more important to you, is it the house or John? The focus of the first sentence is on the "house", we can just say "it's the house" or "it's the right house" The focus of the other sentence is on "John" since his name came before the house and followed by the 's which may be there to tell us that John is the important thing here so the scope is on John, not the house itself.