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According to Kaba Ilco you can specify as long as you are using one of the existing key combinations from the factory.
The indirect read codes starting with CH are not a part of the camlocks that we sell. Kaba Ilco key codes are:
As long as we are not trying to match a combination from another cam lock manufacturer, you can specify KA and I can code it so all cylinders will be keyed to the same combination and can be reordered at any time as a replacement or add on.