The same patch works for both discs.
For disc 2, it allows it to play without first inserting disc 1 (still requires a 32x to play).
For disc 1, it allows it to play without require a switch to disc 2 (allows you to play non 32x version with a 32x installed).
Modify word at ISO location 0x786 to be anything except 0x01FF. Location 0x796 for for the BIN of a BIN/CUE image.
MD5 734b207fb21ab872918d7c750585ffb9 Fahrenheit_Disc-1(US-Genesis-32x).bin
MD5 5a7754e79a797c240216324981d465ee Fahrenheit_Disc-2(US-32x-Genesis).bin