There are many differences between poetries in "Zokihoshishu" and those selected in other poetry collections including 25 poems found in the imperial anthology, and "GoShui wakashu" includes two poems by Zoki that are not found in "Zokihoshishu", so these facts imply that there were another personal poetry collection of Zoki in addition to "Zokihoshishu."
勅撰集入集の二十五首をはじめ他歌集所載歌とはかなり異同があること、『後拾遺和歌集』には本書に見えない増基歌をなお二首収めることなど、増基の家集に本書とは別のものがあったことを示唆する。