Well saved! They are quite similar but I would need to look at the circuits, there will be lots of detail differences. The vidicon head BD896 had a smaller power requirment than The I.O. also the tube suppies were simpler than the I.O. I ll try to find what the differences are.
I have a MkIV vidicon head, but no CCU or PSU so if you could do some pictures and send them to me I would be able to add them to the camera museum.
regards
Brian
www.tvcameramuseum.org