Yes, the hotend is compatible with the older version of the K1 printer, including the older version of the K1 Max. It is designed as a drop-in upgrade for these models without requiring firmware changes or modifications to the printer's build volume or z-height.

Regarding cables and adapters, there is no mention of needing any adapters or cable changes for installation. The hotend maintains compatibility with the existing printer specifications, implying that the original cables can be used without modification.