In comparison, pickleball balls are slightly smaller and lighter than pop tennis balls, weighing between 0.78 and 0.935 grams (22.11 to 26.51 ounces) with a diameter between 2.874 and 2.972 inches (7.30 and 7.55 cm). This may not seem like a significant difference on paper, but in action, it can make all the difference in how the game is played.
https://pickleballyard.com/pop-tennis-vs-pickleball