Both instant and regular pudding mixes come in powder form in boxes. They are both made with pre-gelatinized starch. Pudding mixes are combined with milk resulting in a soft, creamy custard-like texture. Instant pudding mixes take only a few minutes to mix up, and then they are ready to eat, once set. Regular puddings are cooked and take longer to set. Pudding mixes are used in desserts, pies and eaten as is.