Not much further in Balkans. Ottomans kinda reached their maximum range when they besieged Vienna. Everything past all of Hungary would have been hard to maintain.
The same goes for Italy. I know there's a certain interest given there, due to the OTL capture of Otranto, but depsite huge italian division (with some italian princes actually not minding turkish presence, generally the further ones) I don't think that Turks would have even an interest having a second "hot" border that could mean an earlier meditteranean focus for Spain.
I could see, granted, a temporary (going up to some decades rather than the short-lived conquest IOTL) control (from sphere of influence to actual garrisoning) more widespread in southern Italy with several semi-fortified or fortified points (rather than a whole region) as their main interest there was taking slave rather than imperial conquest.
However, western holdings in Eastern Mediterranea are probably first in line for this. Latin states in Greece, Venetian holdings, etc.
You could see a more important Ottoman takeover of Black Sea, going as far as actual imperial expansion rather than rule by proxy, critically if Muscovy/Russia is off the game.
Quicker conquest of Balkans and Danube basin could make Turks range in Eastern Europe reaching same latitude than in Central Europe.
Basically : all of Hungary, all of eastern Adriatic coast and part of modern Ukraine and Romania instead of vassalizing it.