1, Qian Wen is different. Zhu Yuanzhang's seal script was copied from Kaiyuan in the Tang Dynasty, and the word "Kai" was changed to "Zhou". The word "Zhou" is square and symmetrical, and the word "Yuan" is horizontal and left-handed. Compared with Kaiyuan, the word "Bao" is smaller. The words at the back are illegible.
2. Different fonts. Zhu Yuanzhang, Bao Tong and Qian Wen are a formal script, with two parts of the seal; The word behind is seal script.
3. The casting is different. Joo Won's foundry in Bao Tong is mostly unskilled, while that in Qian Wen is mostly unclear; The words at the back are illegible.