I think - from Google - that it's
DipCABT (I think you've made a typo!) coape.org/coape-courses/coape-diploma-in-animal-behaviour/
KPA CPT = Karen Pryor Academy - she has a good name (particularly around clicker training) but I've no real knowledge of the qualification itself karenpryoracademy.com/ctp/choose-kpa-ctp/
She certainly doesn't look like an awful option, though I don't know enough about those qualifications, and tend to direct people to APDT (trainers) or APBC / CCAB (behaviourists).
Do you need a trainer or a behaviourist?
Trainers deal with training new things - sits, downs, house training, recall, not jumping up at people, that sort of thing. The sort of thing every dog needs to know.
Behaviourists deal with issues that are more deep seated, and work to change the dog's emotional state (fear, invariably) to change the undesirable behaviours. They deal with things like reactivity, aggression, separation anxiety, resource guarding and so on - the more pathological end of the spectrum.