pckid (./3) :

i have some questions :

i see for 32 pins : the chip is ST M27C1000
but for the 42 pins can you give me a reference ?

The chips for P, C and V roms have 42 pins (M27C800 = 1 MB, M27C160 = 2 MB)
The chips for M1 ( M27C1001) and for S1 ( M27C1000) have 32 pins.

pckid (./3) :
Did you know a list of games which each title show the reference board for aes and mvs ?

For AES boards: http://www.arcade-collector.com/search-neogeo-board-prog42g (check the right menu boxes for other PROG Boards / CHA Boards)
For MVS boards: http://mvs-scans.com/index.php/Main_Page or https://wiki.neogeodev.org/index.php?title=Category:Cartridge_boards

pckid (./3) :
How size can you put on samurai shodown ?

I think the maximum would be: P roms - 1MB + 512k, C roms - 8 x 2 MB, V roms - 3 x 2MB

pckid (./3) :
What the card get the best size on neogeo aes and / or mvs.

The combination with the most rom space is PROGBK1 (https://wiki.neogeodev.org/index.php?title=PROGBK1) + CHA512Y (https://wiki.neogeodev.org/index.php?title=CHA512Y)