The milestone values used in the game for the star milestone messages (1 star, 3 stars, 8 stars, 30 stars, etc.) are stored in an array of unsigned bytes in 8032db54/0e8b54 - 8032db59/0e8b59. Each milestone value displays text dialog 141 + i (i = its array 0-index) when Mario collects that amount of stars.

If you want to rearrange the dialogs in your hack, you can change the offset from 141 by editing the immediate of the assembly instruction in 802572f8/0122f8 (addiu $t2, $t1, 141)

By default, the array contains six values, though it can be extended to seven or eight values without colliding with other data by editing the immediate of the assembly instruction 80257310/012310 (slti $at, $t4, 6). The numbers of the new dialogs will naturally be 147 and 148 (unless you changed the offset).