Not all cars are the same and even different models of Citroen cars are different from each other. When you go in to insure your car, there are various factors that determine the amount you will have to pay for insuring the same. The main and deciding point is the build of the car. If the car is build solidly, there will be lesser chances of it being damaged in the event of an accident and hence such cars will attract a lower insurance premium.
When you are going in to insure your Citroen be sure that you know about the ruggedness of the particular model you have. Most Citroen cars are renowned for their ruggedness and hence attract a lower premium. However, if you are going to insure an antique Citroen car, like the ones first manufactured by the company, then be prepared to pay a higher insurance. There are some brokers who specialize just in Citroen cars and you should seek them out for insuring your Citroen.