I haven't found a conversion chart, but I think I know how you can convert. So the current bands for Math/Reading SAT Skills Insight are:
6-14
15-19
20-24
25-29
30-34
35-40
It looks like they used to be:
200-290
300-390
400-490
500-590
600-690
700-800
It won't be a perfect conversion but...