I'm not sure what you mean by that.

Maybe you mean that you do most of your flying on AF, so consider yourself an AF customer more than a Flying Blue passenger.

Maybe you mean that you were originally a Frequence Plus member, and got transferred over to Flying Blue from Frequence Plus 20-odd years ago?

Neither AF nor KL is an integral part of your Flying Blue number - you can identify yourself as either. There's no internal "division" between AF numbers and KL numbers - there are only just Flying Blue numbers.