To me there is a slight difference between a spotted and a florida gar. It all depends on their spots on the body. Spotted gars are mainly just random spots on their body, hence the name, whereas florida gars have a somewhat different spot patterns on their sides and on the top of the body.
This is a pic of my spotted gar:
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Whereas in comparison with a florida gar:
View attachment 999477
Other than that, mainly in my opinion they're quite the same in size, smaller than an alligator gar.