That's a question you really have to ask the company that makes your boards, as it depends on their process capabilities and what they would have to change to allow the through-hole component. If your board is already is drilled the two extra holes won't make a difference however it's up to their pick and place machine (or personnel) being able to do the throughole components at the same time as SMD, could be nothing could be expensive depends completely on the board assemblers capabilities.