1 twin is due 3 march and the other 4 march is it normal ?

Forget it: You can only have an approximate idea of the date of birth, within 3 or 4 weeks. You do not know the precise date. Twins will usually come early and will nearly always birth within minutes of each other. After the first delivery the other is close behind.

Not a real dates: You don't conceive & deliver twins at differing times/dates. If your provider is using fetal size on ultrasound to give you this estimate, there is a problem. If one baby is that much bigger than the other there may be a twin to twin steal where the larger one gets most of the nutrition. Close monitoring would be needed because this is more a high risk pregnancy than twins are to start with.