I typically order smaller 3kv transformers from WCCD because of the ease of their shipping and access, and any nicer transformers I get from others. In the past, they've stocked Neonpros 3kvs, and I know they also sell CPIs in that size too. They recently sent me an order that didn't have the Neonpro logo like the previous batch I got did. Basically is there any way to be sure these are Neonpros versus CPI? Pics of old and new attached.

The two in your photos certainly look alike.  To be sure, I would just call WCCD and ask.  It is entirely possible that they are now getting them with their own labeling now.  Steve is helpful and he will tell you.

FWIW-- I cannot speak to the newer CPI products, but I know that the older CPIs were terrible about mercury migration due to their asymmetric output waveform.....it was bad enough that I'd never buy another.  So hopefully the ones you are getting at WCCD are just house branded NeonPros.