Can you tell the difference between the touch of a loved one and the touch of a stranger?

Yes.

Explanation:

When you are touching a loved one their skin is a memory in your brain, from sleeping, touching, hugging, etc. them it will have an effect on your 5 senses (Sight, Touch, Smell, Taste, and Hearing). For a stranger that you have never met, it will feel different than a loved one because the feeling of their skin has never been touched by you, so it does not a place in your brain unlike a loved one.

Hope that helped bai!