In my experience, I believe different variations of Blackjack share common rules, such as the basic objective of beating the dealer by having a hand value closer to 21 without exceeding it. However, they also introduce unique features that distinguish them from traditional Blackjack. These variations may involve changes in the number of decks used, alterations in payout structures for specific hands, special rules for splitting or doubling down, and unique side bets that offer additional winning opportunities.