Dissolve between two different textures?

Hi I am still getting used to coding shaders. but I stumbled upon this: https://www.febucci.com/2018/09/dissolve-shader/

And it reminded me how Inkling inks characters in smash:

Does anybody know how I could turn febucci's dissolve shader into a version that dissolves into another texture like shown in the image above?

 

Hello, does anybody know how the effect could be achieved? I've been looking around to see if I could find any free examples to get the similar effect, and haven't seen people use the dissolve effect the way its used with Inkling. Thank you for reading.