I am pretty sure it's correct, but thought it worth checking with someone more knowledgeable than I...
https://www.ebay.co.uk/itm/4MB-30-Pin-Simm-Fpm-Parity-9-Chip-RAM-Memory-4Mx9-5V-70ns-Samsung-KMM594000B-7/274302508296
https://www.ebay.co.uk/itm/4MB-30-Pin-Simm-Fpm-Parity-9-Chip-RAM-Memory-4Mx9-5V-70ns-Samsung-KMM594000B-7/274302508296