Historiographic metafiction is a slightly larger term, encompassing novels that may not center around a historical event, such as Kurt Vonnegut's Slaughterhouse-Five, or not employ the characteristic features of a "romance" as defined by Elias.
Historiographic metafiction denotes novels that could be centered around non-historical events, like Kurt Vonnegut's Slaughterhouse-Five, or ones that don't incorporate the standard elements of romance as described by Elias.