Pretty sure that's the factor most would point out as the difference in the two, but to me Jewel doesn't seem any quicker at all. Not sure that's likely to change much for either at this point in their careers.The only issue she has with her game right now is mental consistency (Jewel as well) and her foot speed is questionable. Sarah is in phenomenal shape (maybe best on the team) and has a great strong build. I’m not sure her foot speed can be helped much. Doesn’t keep her out of the starting lineup so far as I can see though.
Jewel got to the rim some, where as you said, Sara is more of a mid range and post up. Both will be crucial next year.