Are all the seven books in Sikuquanshu the same?

Of course not. First of all, the copying time is different, and it has been revised in the middle. Secondly, thousands of calligraphers have different levels and different working attitudes, which have also caused many mistakes. Take the Jinwen Museum as an example:

The Jinwen Pavilion is the last copy of the Sige version in the North, and it has been three years since the first version of Wen Yuan Pavilion was written. Fixed some mistakes in the first three Ge manuscripts. After Sikuquanshu was written, it was reviewed twice. Among them, the difference with Wen Yuan Pavilion is only 62%, and the difference with History Department is 5 1%. These differences exist not only in the text, abstract and preface, postscript and appendix, but also in articles and volumes. As far as Collected Works of Song People are concerned, Wenjinge is more than Wenyuange by 1000, that is, 128 volumes.