Answer:
Not sure if there's an electrical meaning for this but both terms are synonyms for the chemical with the IUPAC systematic name 2-acryloylamino-2-methylpropanesulfonic acid.
Being a slightly more complex molecule there have been different ways of naming it.
AMPS is 2-acrylamido-2-methylpropanesulfonic acid. The AMPS name is a registered trademark so most other manufacturers use the ATBS name.
ATBS is 2-acrylamido-tertbutylsulfonic acid.
Different names for the same chemical.
This material is widely used as a monomer in the manufacture of polymers for medical hydrogels, water treatment chemicals, scale inhibitors, and synthetic fibres among others.