Do Volvo fuel injectors (1991 940 GLE, 16V I4) have color codes pertaining to the pressures they put out?

My car has 3 beige fuel injectors and one YELLOW fuel injector. I understand with domestic cars, like Ford, the fox body mustangs use different color injectors to signify different pressures, ex. 19 lb, 35 lb....etc.

Does Volvo do this too? Because obviously I've got an out of place injector if so. And I'd like to know which ones belong in my car to be sure. I am almost positive all the injectors are all the same brand as well, basically, stock brand injectors.

Thanks for all help!