Just to remind you guys that the previous Astra generation (the edgy one) came out before the Megane, which copied the proportions and bodyside. As the new Astra GtC came out, everybody said it copies the Megane... Well for sure as it was designed in continuity with the previous Astra, from which the Megane borrowed a lot...
Anyway, today's industry is full of requirements which will make the cars look more and more alike.