Hey,

The "insides" of the injectors from the 2 pictures above are same. There is no difference regarding what is inside them. There is a shim (of course different sizes), a spring (super slight differences with age but not an issue), a bowl like piece with small holes (same), and a piece that looks like a rivit (same). You cannot mix and match the injector body pieces (upper and lower) as noted above, but the insides are the same. Of course, nozzels are important.