when i update my game in iTunes connect will the leaderboards carry over?

if i update my game in iTunes connect will the leaderboards and achievements carry over.

i have left everything related to game center the same in the new update but iTunes connect says "You don't have any new leaderboards for this app"

just wondering if i need to make and integrate a new leaderboard for the update?

TLDR: Yes, they'll transfer.

When you submit an update for your app, any existing leaderboards and achievements that have been approved in previous versions will carry over to the new version.

The reason it says "You don't have any new leaderboards for this app" is because you probably haven't added any leaderboards in addition to the leaderboards previously approved.