What is the difference between small caps and capitals?
Typically a fontâ€™s small caps are designed to rise up to somewhere around the fontâ€™s x-height (or a little higher). Regular capitals rise to the full cap-height. For example, in Adobe Caslon:
Sometimes the small capitals are just scaled down versions of the capital glyphs, but on a well-considered and complete typeface (like in Adobe Caslon above, or in the Franchise Bold font you referenced), theyâ€™re often slightly different shapes, so that their weight and thickness is consistent with the rest of the typeface.
That way, you can set small caps right in line with standard glyphs without the capitals just looking like a smaller font size.