Con-Cor US passenger cars

[Welshbloke]

I have three of the Con-Cor streamlined coaches (not sure if they're Budd or Pullman, but that style), and I'm wondering if they were actually made by Kato on behalf of Con-Cor?

 

I know the two companies worked together on some models, so I'm curious if these were on the list. They're constructed very much like Kato models aside from the truck mountings (which use shouldered bolts screwed into a turned steel tube with a thread cut inside, which doubles as ballast).