I was considering registering my kittens to a new vet. They have already had their first vaccination from the CPL and I was told over the phone that the brand the CPL use isn't compatible with the won they use and I'd have to start them over again. Is this harmful? They have been vaccinated with purevax, no idea what one the other vet uses (companion care), is there one that is better than others or are all the same? I've never actually thought about it before.