Those are great scores! How old is your ds?
What you want to try to do is look at the patterns in the WIAT - were his highs/lows relative to where you'd expect them to be based on the strengths pattern in his WISC scores? You'll also want to look at subtest scores for the WISC if you have them - are they fairly consistent within each group (VCI, PRI, WMI, PSI), or are there large discrepancies on the subtests?
If you want more input from us, it would be helpful to post the WISC subtest scores and the WIAT subtest scores. It would also help to know if your ds is young, and if he was on task or distracted during testing.
Best wishes,
polarbear
