Happened with many other brands. Just like the Gitane TDF and Criterium shared a frame in the 80's, both using the same Vitus 971 frame but the bikes came in different paintjobs with the Criterium in blue and the TDF in red. Peugeot did similar with their mid 80's PSV/PSN/Triathlon/Victory models with the same basic Vitus 980 frame, the only difference being colors, graphics component groups and an additional base-on fitting here and there for the Triathlon model...