Yes, it is normal. Not really unusual, at all, for best friends to have the same dream at times. We tend to develop psychic link with Best Friends.
Friends often think alike, I know my best friend does and yes we've dreamt the same things too and had the same thoughts
I guess in the laws of probability that has to happen sooner or later. Now if you see the same but different things each night for a week then something might be happening.
Yes, stray cats can often cover a lot of area in one night...lol