In-person and Person-to-person

In-person adjective - An appearance carried out personally in someone else's physical presence.

Person-to-person and in-person are semantically related. In some cases you can use "Person-to-person" instead an adjective phrase "In-person".

Person-to-person adjective - Involving direct communication or contact between persons or parties.

In-person and person-to-person are semantically related. You can use "In-person" instead an adjective phrase "Person-to-person".