ECT Valve PYFA-15-16ZA or PYFA-15-16Z?

I'm pulling the trigger on replacing my thermostat and not wait on mazda to sit on their hands approving the cost of fixing a mistake they should own in the first place.

There are two parts that fit my 2018 CX-5 2.5L AWD, Touring, gas, non-turbo:

PYFA-15-16ZA or PYFD-15-16Z

I've heard that the "A" appendixed version is the next which supposedly eliminated the stuck-open issue.

Does anyone know which one should I pick or if there is a cheaper repair kit, this mistake is kind of costly to pay out of pocket - $450