The original brochures are also available...
http://www.tvcameramuseum.org/pdfs/bosch/kcu40broc.pdf
https://www.tvcameramuseum.org/pdfs/bosch/kckbroc.pdf
So all three tubes were 1.2". However, at least on the KCU 40 the blue channel had a smaller image size, which was a bit tricky and the method to match the channels was later modified against the original design.
The four tube camera delivered by Bosch Fernsehanlagen was called "KC 4 P 40", and it was in essence the General Electric PE-350, offered as an interim solution after they abandoned the project to design a IO colour camera (they gave up after prototypes suffered from unmanageable registration) and went straight into the development of a three Plumbicon design. I don't know if any of these four tube cameras have been delivered to TV stations outside Germany at all.