MS-7030 Mainboard won't program BIOS chip model other than oryginal

[san]

Hi!

Recently i bought mainboard compatible to flashrom.pinned oryginal bios
(SST49LF004B) and other chips.
I do not own exacly same chip, so i tried to replace with some i have:

SST49LF004 / 4A (and smaller 2A and 3A)
Intel 82802AB8

but no luck - i can not even read those.
I replaced back the original chip and i am able to program modified bios.

What is the problem?

Best regards!