In regards to the PS3 number, whether it is 364k or 374k, a small amount of rounding can easily make up the difference.
Microsoft sold 438k 360's and had 42% current gen market share. Nintendo sold 240k Wii's.
If they really had 41.6% market share (rounded to 42%), that would put the PS3 at 374.9k. Any rounding on Sony's 20% number, or the sales numbers for the Wii or 360 would also muddy the number.