"Same to same" is a phrase used to indicate agreement with a statement in a playful or silly manner. It suggests that the speaker is in the same situation or has a similar experience, and is acknowledging this by saying "same to same." The phrase implies that both parties are on the same page and understanding each other in a lighthearted way.
"I can't afford to go out for dinnertonight, same to same?" said Jane, acknowledging her tight budget in a humorous way.
Tied to the same post is similar to saying we run in the same circle. It’s described as two or more people connected to a post and only being able to walk in the same circle as far as they can reach.