According to Matches, "the Vara C is a slightly wider-fitting version of Salvatore Ferragamo's iconic almond-toe pumps", so presumably the Vara 1 are a narrower fit. I vaguely seem to remember in the past a sales associate telling me that their were different toe box shapes for the Varina so I guess the same may apply to the Vara as well?
Having a look at some pictures of Varas online, I guess I can see what they might mean, although it is hard to compare photos of shoes that may be of totally different sizes:
Compare top Red Patent Vara 1 with Patent bow from Harrods online with Red patent Vara C with cloth bow from Matches below. Its hard to see a difference but I do think the all patent version does look overall more pointy and therefore narrower, whereas the cloth bow one seems shallower in the toe box (wider?). How confusing! Its hard enough to find the correct width without having to take into account different versions of the same shoe! I imagine they must also have a very different look on if this is true...
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http://www.matchesfashion.com/products/Salvatore-Ferragamo-Vara-C-patent-leather-pumps-1015868 and
http://www.harrods.com/product/vara-1-patent-pump/salvatore-ferragamo/000000000004677477#