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Robert, that is the only difference but, when all is said and done, if it does not appear on the CA DOJ approved Handgun Roster as a Semi-Auto, it is not CA legal regardless the features. The actual Roster is here and you can search any manufacturers compliant models : https://oag.ca.gov/firearms/certified-handguns/search?make=All
The Firestorm has Finger Groves and Over-Sized Rubber Grips, the Thunder does not. Firestorm Trigger Guard is rounded, the Thunder is scalloped and serrated. Firestorm sights are Glock-like with a dot front post and U outline rear sight, the Thunder is simple 3-dot. Otherwise – it is the same gun. Hope this helps.