Fastest way to check that in the future is to look at the value in the ECU's self learn. If the code doesn't match the injectors, the values will be ways away from the perfect '100%'.
Glad I got 740s & had them flow tested.... seems like there's a lot of whacky injector stuff going on anymore from the OEM.
Later
When was the last time you *really* did something with your Z to call yourself a Z enthusiast?