This code works on a real N64 and emulator and replaces the Goombas' heads with Peach's head in Bob-omb Battlefield by

copying the Peach graphics to the expansion pack.

The code is called:

Change Goomba head to Peach's head using Press L to copy memory code

Which is at my site at:

http://sites.google.com/site/jamesskingdom/Home/game-codes-by-james-s/super-mario-64-codes

Thanks for viewing and please have a look at my other videos.