High impedance headphones are usually less finicky than lower impedance headphones, rather they just require more voltage. They’re actually an easier load for a headphone jack assuming it can get loud enough before clipping the opamp. Low impedance headphones are problems from a damping standpoint and low-end roll off depending on the resistance of the headphone jack driving them. Technically a headphone jack driving such a headphone should have near-zero resistance and not a native high impedance. The Prime gear jacks seems to have far more necessary voltage on them than they need, so I think you’ll be fine. I have no idea how they’re loaded, but with a higher impedance headphone that issue is moot. If you’re doing headphone-only mixing, which I’ve been doing a lot of lately, you’re going to destroy your ears long before you run out of voltage with the HD600. Hence the reason I’ve been asking for a bigger headphone attenuator in their Utility settings. If you’re not doing headphone-only mixing, your current headphones are better suited to DJing purposes with speakers in the background than the HD600 is.
P.S. Be careful with your ears. Wear and tear on them will have a much larger effect on your ability to hear sound than any headphone or speaker upgrades.