A question about SPI flash operating frequency
Unless the datasheet states otherwise, you should assume that the clock speed should remain consistent throughout a single command. (For instance, for a single-SPI Read Data instruction, the entire instruction should be clocked at 33 MHz; you shouldn't try to clock the instruction or address at 104 MHz.)

In any case, most microcontrollers won't even allow you to change the SPI clock speed partway through a transaction, so this is kind of a moot point. :)