You can't come back here once you leave.
You can't come back here once you've left.
Do both the above sentences mean the same?
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Sign up to join this communityThey're different tenses, but they have no significant difference in meaning.
From this website, they are are simple present and present perfect (respectively).
According to various forms, this is common among the US and UK and both should be understood equally, although you leave is far more common.