With RSU's, CA taxes non-residents on the wage income to the extent that services were performed in California from the grant date to the vesting date. See Section G of this California tax publication:
https://www.ftb.ca.gov/forms/misc/1004.html
In other words, as a CA non-resident, income from RSU's with a grant date after you ceased working in California would not be subject to CA income tax.
Your new resident state would normally grant you an "other state credit" if you have income that is taxed by both CA and the new resident state. (Note: if the new state is AZ, OR, or VA, the credit would be "reversed" - it would be granted by CA, not by the new resident state.)
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
