i'd suggest you stick with oem/stock 295cc injectors...probably get them cleaned and flow tested by a reputable place...no need for a retune, money saved
the flow rating on the 3sge injectors have various flow rates on the internet---315cc - 350cc which is a relatively wide gap....this may affect stock ecu fuel control capabilities ...then there's always the question of the fuel pressure used to determine the flow rates and between the cars themselves