I just installed my DK High Score Save Kit (bought from Arcadeshop), and to my surprise it looks, plays and feels like the US Set 1 now, when I have the Japanese ROM set on my PCB (most notable differences are the order of levels and the ability to enter up to 12 letters in the record table).
Interestingly though the walking sound is the "uniform" sound and not the one with the slight variety in pitch. This was also the case with the original ROM set, however.
So my question, out of interest, is what the Save Kit actually does. Does it still make use of the chips on the PCB or is it now all running on the Save Kit board? Why isn't the walking sound the variety kind?