No, Macintosh II or Macintosh IIfx SIMMs will not work.
The main specs are: 1MB, 256K ICs, 64-pin SIMM, 100ns. Use the Macintosh
Display Card DRAM Expansion Kit (part number M0505LL/A) to upgrade the card.
There are other specs that are required that we don't publish (we provide it to
RAM distributors). You will need to contact the third-party RAM manufacturers
and simply ask for SIMMs that will work with the Macintosh Display Card 8*24
GC.