Session results and the RTP version
A spin can open with a few scatters or none at all, and nobody sees the bonus coming. How often Free Spins start is not known in advance, and the result of one session is random whatever the RTP version. Two players with the same bet can finish far apart. The figures on this page describe the game over many rounds, not a single visit to the reels.
Every spin on the reels is settled against one RTP version of the game. Which version runs here is shown only in the game rules, not on the reels or in the bonus round. Check the rules before you compare one version against another.
The top of the paytable is reached very rarely, and the maximum win of Sweet Bonanza 1000 is a ceiling, not an average. Multiplier bombs in Free Spins multiply a tumble sequence at a random value, so no feature promises a large result. Treat the top prize as a limit, not a target.