McLaren F1 Team is open and free teem, but obviously, you have to work hard
Hamilton, who ended his long association with McLaren over the winter as he moved to Mercedes, said recently the British team is "a really controlled environment where you are restricted to do and say what you are told".
On Thursday, he repeated his claim that he is now far more relaxed in F1.
"The freedom I have in this team is phenomenal," he insisted.
"It's so not like that," said Button, referring to Hamilton's description.
"It's a very open team, free team, and a team that will do anything for you."
According to a report in the Associated Press, the difference between McLaren and Mercedes is that the German carmaker can partly fund its team with mass road car sales.
Button agreed: "In this team, you work, you have to work, and perhaps harder than in other teams.
"Initially when I came to the team, it was a shock. You learn to understand, to adapt -- that is the job."