Got to correct myself: KM44C1000Z-8 is 4x1M - they should work!!
4x1M per manufacturer:
MCM514400 Motorola
UPD424400 NEC
MSM514400 OKI
KM44C1000 Samsung
TI44400 TI
TC514400 Toshiba
MB814100 Fujitsu
GM71C4100 Goldstar
HM514100 Hitachi
HY514100 Hyundai
MT4C1004 Micron
M5M44100 Mitsubishi
not all available as ZIPs, of course - never knew there where that many different names...
Now, where did you get those at? ;-)