The two have nearly identical wheelbases, but the Prius c is 15 inches shorter overall. (articles.orlandosentinel.com)
The new Aygo is slightly longer, wider and lower than its predecessor, so looks a little less truncated from some angles, even though it has an identical wheelbase. (autoexpress.co.uk)
[61][62] Body dimensions were largely unchanged from the previous model, including an identical wheelbase, [59] although length increases 100 millimeters (3.9 in). (en.wikipedia.org)