be carefull with that, there maybe a pinout difference depending on manufacturer,(Cypress may be different?) I think it was MKL that pointed this out earlier, may be worth a PM.
it's the 256k ram from cypress (cy62256) that has a different pinout and can't be used as a replacement for the work/video/backup ram on the neo.
as for the package size of the 6116 used as the sound ram, it depends on the MVS model: on the MV1, MV2 (not MV2F), 4-slots and 6-slots you can use either a 300mil (slimmer) or a 600mil (fatter).