Delta's higher end tools may be unique to them. The lower end ones are Taiwanese. A cousin bought their 13" planer and it was identical to a King Canada I have for all practical purposes and my King uses the same gear box, motor, bed, head, and columns as several others. I'm not familiar with that model you have but I would suggest that you look at Jet and Star if they are still around. Possibly Grizzly too as I thing they may come fro the same factory or factories as King, Jet, and some others. If another one looks really similar then it probably is a clone. It also might not be that critical. If the tailstock is made for a lathe with a given swing diameter then the only other factor that matters is the gap between the rails.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.