Winter Arctic Sea Ice Extent at Lowest Peak Yet

The maximum extents of winter sea ice in the Arctic are their lowest values yet, according to two different datasets, JAXA v2 and NOAA. (I think it's fair to call the peak now, several days after.)

JAXA v2 has Arctic SIE peaking on 3/6/17 at 13.878 Mkm².

NOAA has Arctic SIE peaking on 3/5/17 at 14.447 Mkm².

Don't ask me how these two datasets can differ by 569.000 km². That seems like a lot, for a basic measurement (even by satellite). I don't understand it either.

But both are the lowest winter maximums in their records, going back to 1979. That counts for something.