Indexing happens in the levers on all modern groupsets that i'm aware of. The derailleurs are just a hinge with a spring - the levers dictate the amount by which the mechs will move. If your shifters aren't indexed it will make no difference. Hope this helps.
Also with front mechs there's not much to them, so they're probably the least important bit to have matching (correct me if i'm wrong).
Indexing happens in the levers on all modern groupsets that i'm aware of. The derailleurs are just a hinge with a spring - the levers dictate the amount by which the mechs will move. If your shifters aren't indexed it will make no difference. Hope this helps.
Also with front mechs there's not much to them, so they're probably the least important bit to have matching (correct me if i'm wrong).