oops.I "think" I misread that question.
Your asking if range enhancer artillary techs work for ships that use indirect fire ?
Which off the top of me head i dont rightly remember the answer to.Ill try and remember to check when i get home from the shop.
Not all the artillary upgrade techs are range bonus oriented though.Im pretty sure some are reguired techs for units.
Like rail gun tech, which IF
i remember correctly is required for the DDX.
Found a thread that answers the question: