I know I made 2 other Silver Dalmatian axolotls, but this is the best of them in my opinion. They are each unique, so I haven't removed them. In real life lavender axolotls look like this rather than actually lavender colored.
If you want the same skin but with the back having the post 1.18 texture, here it is: https://www.planetminecraft.com/mob-skin/real-lavender-axolotl-silver-dalmatian-v2/