There are two separate problems with mounting earlier C lenses on C33 later auto cocking bodies. With the 180mm (18cm) it is the diameter of the lens mount not clearing the cocking arm. Later 180mm have a cut away portion and a cocking extension to accomplish that task. I have an otherwise nice 180 where someone has ground away part of the base of the lens to clear that arm but it still needs to be cocked manually. I tried to retrofit the newer lens mount from a damaged lens but it doesn't seem to fit. None of the very early Seikosha MX shutters (1 - 400s) will work on an auto cocking body because the the cocking stroke (if you will pardon the expression) is too short on the MX. I can say (and correct me if I am wrong) that all Mamiya TLR lenses will successfully mount on any non auto cocking bodies; that would be the C, C2, C3, C22, C220 and C220f.
The extensions on your 18cm lenses are probably on the shutter release side not the cocking side; all the 180s and the 250s have that; although I am sure many pre C33 18cm were retrofitted with the auto cocking mount.