This article describes a joint research work between Monash University and the University of Alicante, where software originally meant for plagiarisman and copy detection in academic works is successfully applied to perform comparative analysis of different editions of literary works. The experiments were performed with Spanish texts from the Miguel de Cervantes digital library. The results have proved useful for literary and linguistic research, automating part of the tedious task of comparative text analysis. Besides, other interesting uses were detected.