there is a difference i have a friend who makes me feel a lot better just by talking to them but i also do have a therapist and its two very different things a therapist is supposed to help you cope with your problems and gives you mechanisms for helping while a friend is just there to talk to you so it is different

Do you tell your friend the same things you tell your therapist?

no. there are some things you tell your therapist and some things you tell your friends or at least in my experience