Carb for a 5hp Briggs?

What is the difference between the various diaphragm type, horizontal flat head carbs for the different numbered engines?
I see different air cleaner mounting, and different choke systems.
Is that all?
Also, why do the slide choke carbs cost double the money,
and will a 1 quart tank work if needed?
 
There are 2 basic designs.the older slide type choke and the newer butterfly type choke. There is almost nothing interchangeable between the carbs. The linkage is different and so is the tank. The block bolt pattern is the same so you can put an old style carb and tank on a new style and vice versa but all the linkage needs to change too.
 
I'd get a gallon or two of white vinegar and soak the insides, and look up videos on sealing gas tanks, you need to seal them so they don't start rusting again, Taryl Fixes All did a good video on that.
 
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