No, they are not the same, but the terms are often used interchangeably and are somewhat similar. The payout rate at an online casino is calculated from the amount of real money paid out from winnings by the casino in direct proportion to the number of wagers made by players over hundreds of thousands of bets. By this definition, it has been noted that the higher the average casino payout rate, the bigger the win rate and the larger the theoretical return of money to players. On the other hand, RTP percentages only theoretically indicate the return of money from each of the games.