1. Status: Yi Guogong was the title of Qin Qiong, the founding father of the Tang Dynasty. This title has a high status and belongs to one of the top titles. Hu Guogong is a lower title in the imperial clan of Li Tang, which is mainly awarded to the royal branch.
2. Honoring objects: Yi Guogong's honoring objects are mainly non-imperial clan members who belong to the royal family or have made outstanding contributions. For example, Li Shimin's confidant general Qin Qiong was appointed as Yi Guogong. Hu Guogong's award targets are mainly royal branches, such as distant relatives of Li Tang's imperial clan.
Generally speaking, there are obvious differences between Yi Guogong and Hu Guogong in status and recipients.