this is the reply i got....
Hey,
I had a chat with the suppliers about this and seems they are in actual case same flow at 3 BAR, the unit's purchased do have a better spray pattern then the 1000cc injectors modified unit's hence the $30 price difference.
You are welcome to forward this onto the thread if you like
Be rest assured I was only going off what the suppliers send me.
The 1000cc injectors are modified so that's why we have the same injectors in 3 possible options of 525cc, 750cc and 1000cc.