After reading the movie's novelization and it's other paperback novel, Man, Machines and Monsters, one image caught my eye, specifically this one, this image is in the Man, Machines and Monsters book, so I would think it is canon.
This image is interesting, as it directly contradicts what the PPDC believed in during the Kaiju War, that each Jaeger is designed to combat different types of Kaiju. Every Jaeger is unique in the same way that each Kaiju is unique (in terms of abilities, skills and features). This would mean that the PPDC would only build one type of Jaeger at a time to combat new Kajiu threats, like Coyote Tango and it's back mounted Mortar cannons and now Horizon Brave and it's shoulder mounted Cryo Cannons.
This raises yet another question, If the belief is to be followed stringently as it is seen in the movie and the novelization, why would the PPDC build more than one Jaeger of a specific class/set/specification at any given point in time?