Generally, Bosch style injectors are all the same size. They might vary slightly on the tip where the fuel sprays out, but otherwise they are the same. Same connectors, same o-ring size, etc. I think only when you get into Japanese stuff, like Denso, do things change.
Be wary of the impedance - you need high impedance if you are going with stock components. Low impedance will require a resistor pack. If you are going for a mild upgrade, 24 or 30, then stick with high impedance. When you want to get serious, for example with stand alone engine management, or some other EFI tweaks, then you can run low impedance injectors.
Actually, that's maybe the wrong way to think about it. It just so happens that high flow injectors are usually low impedance, so it's not like one goes out searching for low impedance injectors, it just happens that way - does that make sense?