The subject Peugeot bike and the Donnay posted are definitely 2nd gen, post 1986 model, ALAN Carbonios. With just a very few detail differences from my 1986 Carbonio that is in the pic......
If there might be any mention of Donnay supplying Procycle/Peugeot with the frames, it could be that they acted like middlemen to sell the frames to Peugeot, as Donnay got them from ALAN.