Yes, they have the same meaning. I don't know that I use either one commonly, but they are both reasonaly common. So is "It doesn't matter how tired you are.
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AnonymousHowever tired you may be, you must do it.Both are correct. I think I probably use them about equally (but not terribly often).
No matter how tired you may be, you must do it.
Do they have same meaning? If yes, do you use the first sentence commonly?