Did Sun Tzu say “Know your enemy and know yourself”?

Did Sun Tzu say “Know your enemy and know yourself”?

Found with small differences. Found almost word for word in works attributed to Sun Tzu. Compare with the original below.

31. Hence the saying: If you know the enemy and know yourself, your victory will not stand in doubt; if you know Heaven and know Earth, you may make your victory complete.
The Art of War — Sun Tzu, ¶706 · Public domain (US), Project Gutenberg #132 · source

18. Hence the saying: If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat.
The Art of War — Sun Tzu, ¶287 · Public domain (US), Project Gutenberg #132 · source

31. Hence the saying: If you know the enemy and know yourself, your victory will not stand in doubt; if you know Heaven and know Earth, you may make your victory complete.
The Art of War — Sun Tzu, ¶278 · Public domain (US), Project Gutenberg #17405 · source

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