Jadis DPL2 vs. Jadis JP15


Has anyone been able to compare the Jadis DPL2 pre with the JP15? Judging by the specs, they seem very similar apart from input impedance (42kΏ vs. "more than" 100kΏ). Are there noticeable sonic differences? Any cabling peculiarities on account of the different input impedance?
Thanks for your advice.
karelfd