I'm not sure about the MN63F81MPN flashram, I haven't found a cartridge with that chip inside yet myself. Even my Majoras Mask has the standard MX type.
So far I found out:
Animal Crossing
MN63F81MPN
April 2001
Command & Conquer
29L1100KC-15B0
May 1999
Jet Force Gemini
NTSC:29L1100KC-15B0 PAL: 29L1101KC-15B0
October 1999
Ken Griffey Jr's Slugfest
29L1100KC-15B0
May 1999
Zelda Majora's Mask
29L1100KC-15B0 or MN63F81MPN
April 2000
Megaman 64
MN63F81MPN
November 2000
NBA Courtside 2
29L1100KC-15B0
October 1999
Paper Mario
MN63F81MPN or 29L1100KC-15B0
August 2000
Pokémon Puzzle League
29L1100KC-15B0
September 2000
Pokémon Snap
29L1100KC-15B0
March 1999
Pokémon Stadium
29L1100KC-15B0
February 2000
Pokémon Stadium 2
29L1100KC-15B0 or MN63F81MPN
December 2000
Starcraft 64
29L1100KC-15B0
June 2000
Tigger's Honey Hunt
29L1100KC-15B0 or MN63F81MPN
November 2000
WWF: No Mercy
MN63F81MPN or 29L1100KC-15B0
November 2000
So I still need to buy one of the MN63F81MPN games to check it out. Auto detection of flashram type won't work but you should be able to manually choose both of the MX types and dump the save, then send the dumps to me so I can make adjustments to the code.