The computer called Mother first appears in Dino Stalker and then later in Dino Crisis 3. Furthermore, the idea of genetically modified dinosaurs is introduced here in Dino Stalker first. Also, Dino Stalker very loosely sets up the story of Dino Crsis 3.
Dino Stalker (or Gun Survivor 3: Dino Crisis) is a spin off which continues the story of Dylan Morton and Paula from Dino Crisis 2, as well as using archive footage from that game.