The main components are the same for both:
A ceremony is combined with a meal, to remember how God saved the Israelites out of slavery in Egypt:
Drink 4 cups of wine (or grape juice)
Answer 4 questions that explain the distinctives of this celebration
Eat Matzah (unleavened bread), bitter herbs, and kharoset (brown apple mixture)
Review the story of the first Passover, including the 10 plagues
Sing the song, Dayenu
Eat the Passover supper
Let the children redeem the afikomen (the hidden unleavened bread) for a prize
Because we are not Jewish, and my main goal is to re-enact the last supper, we feel free to leave things out, or rearrange them to fit our needs. For example, we do not eat unleavened bread for 7 days, or rid the house of all products that contain yeast or baking powder. When the children were small, and hungry, we went ahead and ate the supper first, then followed with the ceremony. When we are in the U.S. where kosher Matzah is readily available, we buy that. But most of the time, I make my own unleavened bread. But most of the changes are in an attempt to more closely follow what Jesus and the disciples did. We follow the Messianic Passover Haggadah, with a few exceptions