Hhmmm....Yes, what he said. CA & other states' limited-capacity magazines have the same external specifications as the standard-capacity magazines; the limited magazines are fixed so they can't accept a full complement of cartridges.
I'm afraid that you may have made your escape from CA a little late in terms of re-supplying with magazines. Everyone's forting-up (i.e., siege mentality). If you're lucky, you may be able to find ammunition for what you have.
Time will tell. May Providence bless the United States of America & the Constitution for which it stands--Patrice