Um - the head rank ID controls the voltage required to properly fire the nozzles and is really specific for every head manufactured. This is also affected by the machine brand itself and how the machine manufacturer has configured their mainboard which is why Mimaki, Mutoh, Roland, etc all use different types of head ID numbers for the exact same DX4 heads. The biggest problem you will run into is overspray and misting from some nozzles getting too much current. No amount of tweaking your media profiles or linearization curves can correct that.
Dont get me wrong - any DX4 head will install and work. I've done it myself getting heads originally packaged for other brand machines (hence did not have a Mimaki head rank ID) so I just went with it. One head lasted under a year and I pretty much had to battle constant misting and overspray problems. On another head the misting was not nearly as bad and I got a little over a year from that one before there were just too many unrecoverable nozzles. Finally got a head with a proper Mimaki rank ID number - lo and behold - perfect printing and still perfect 2 years later.