Went to my local store a few days ago and felt the need to do this comp. While the colors are close, they do look distinct in-person - Tidal Teal is probably a shade lighter and Washed Blue is bluer if that makes sense. (Did not buy the Washed Blue Define, but did buy the cropped Light Ivory Define (8) in the background).

Hotty Hots 4” (6) - Tidal Teal Full Length Define (6) - Washed Blue