Sorry no idea about the Cambria - although I do know that in Europe Cambria is used to pretty much describe anything from the Oncidium alliance, and is kind of misleading.
If your first one is labelled Red Knight, why are you worried about it not being that because of the scent? As Miltonia Red Knight is a grex, it is perfectly possible that some of the offspring created by the original cross are scented even if most are not. If you look through Miltonia posts on this forum there was a thread recently about one particular milt with a photo, where another forum member had the exact same grex plant, but one was red and one was white.
So you probably have got a genuine Red Knight, - unless someone knows something more specific about it's parentage (Piccadilly x Mrs. J. B. Crum) and why it wouldn't ever be scented. Anyway, that's my thoughts on it,... of course I could have it all wrong!