The difference, by the numbers
They have no ingredient in common: the Cinderella has orange juice, pineapple juice, lemon juice, grenadine and soda water, the Lemon, Lime and Bitters lime juice, lemon-lime soda and alcohol-free aromatic bitters. In parts, a Cinderella is 2¾ orange, 2 pineapple, 1 lemon and 2¾ soda; a Lemon, Lime and Bitters is 1 lime and 10 lemon-lime soda. By volume, the Cinderella is 86% mixer and juice and 12% citrus; the Lemon, Lime and Bitters is 91% mixer and juice and 9% citrus. Different bottles, similar balance: that makes them close cousins on the ratio map.
They are about equally strong in the glass (both 0.0% ABV), and they hold about the same alcohol (0.00 standard drinks each). Calories are close (about 76 and 68), but the Lemon, Lime and Bitters has more sugar (16.5 g against 13.6 g). Both are served in a highball; the Cinderella is shaken, the Lemon, Lime and Bitters built.