In the rulebook, wrong ball situations are covered in Rule 15.
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More Golf FAQs ...
Wrong Ball
A 'wrong ball'' is any ball other than the player's:
Ball in play,
Provisional ball, or
Second ball played under Rule 3-3 or Rule 20-7c in stroke play; and includes:
- another player's ball,
- an abandoned ball, and ...
Wrong Ball Played from Hazard
Q. A player plays a ball from a hazard (water hazard or bunker) onto the putting green. Once on the putting green the player realizes the ball he played was a wrong ball. What is the ruling?
Wrong Ball
Any ball which a golfer plays that is not the ball they began the hole with or which was brought into play after losing their original.
Yardage Chart ...
Playing a wrong ball (except in a hazard) - in match play you lose the hole; in stroke play you incur a two-stroke penalty and you must then play the correct ball.
ON THE PUTTING GREEN ...
Hitting the wrong ball
A player is responsible for the identification of his own ball. He must hole out with the same ball driven from the tee.
7. If you play the wrong ball, except in a hazard you loose the hole in match play or are penalized two strokes in stroke play
8. When the ball must be dropped you must face the hole, stand erect, and drop the ball behind you over your shoulder ...
Rule 15 -- Playing a Wrong Ball
In match play, if you play a ball that is not yours, you lose the hole. If you play the wrong ball in a hazard, there is no penalty and you must then play the right ball.
Hitting the wrong ball.
Hitting a ball or flag on the green.
Requesting Assistance. (what club to use, etc.)
Disqualification
Hitting the wrong ball and not correcting the error prior to the next teeing off.
 See also: Golf, Penal, Penalty, Stroke, Match Play
  
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