Super Secret Area - Dead Ahead!
PAL isn't harder - it's just slower. The time difference comes from the games running at different frame rates. PAL runs at 50fps and NTSC runs at 60. Over the course of the game this equates to somewhere between three and five minutes, so Behemoth's 0:48 run on the PAL version equates to about a 0:44 in the NTSC version. Also, outside of a TAS, I believe the Torizo skip is impossible in an NTSC run.