Does sanyone know if the 305 fuel rail is different from the 350, other than the injectors??

I'm in the prossess of retro fitting a tpi onto a 383. I have a corvette fuel rail and a 305 fuel rail from a camaro. My preference is to use the Camaro rail, because on the Corvette I have to change over some of the accessory brackets. Anyway, I've noticed Camaro has two different part numbers on their fuel rails but both rails look to be the same size. Anybody know what the difference is??

Thanks in advance.

 

Same same.

The only diff I can think of in the different rails is with or without the cold start injector.

 

thanks