Is there a big difference between the versions of the twelve famous books that must be read in junior high school?

Not big. There are twelve different versions of the famous books that must be read in junior middle school, which are from different publishing houses. The contents are very similar, but there is little difference. Twelve famous books that must be read in junior middle school include Flowers in the Morning, Red Star over China, Chronicle of Baiyangdian, Travel Notes of Hunan, Notes of Hunters, Flowers in the Mirror, Camel Xiangzi and so on.