I usually only deal with Bosch, Denso, Ford (Bosch) and Nikki injectors so I'm not very familiar with JECS. This is about as close as I can find on that particular injector.
And I found one page citing 275cc/min which would be in line with the above.
The injector in the first pic has a Bosch EV1 style connector and the injector in the second pic has the Denso style round connector like the JECS you posted up.
All those come in at around 25-26lb/hr and the numbers seem right for a 2.6 because a Mazda 1.8 BP engine uses a 254cc/min-24lb/hr Denso injector and a Miata 1.6 B6ZE uses a 212cc/min-20lb/hr Denso injector (although I have seen some 230cc/min-22lb/hr units floating around which is usually a Mazda 1.6 B6D injector)
Sorry Angus, I know that only answers half of your question but I would need the specific numbers from both injectors. I'd say if the 2600 uses a 26lb/hr and a 1.8 DOHC uses a 24 then the 2200 should be at least 20-24 lbs/hr.