No it wont be changed unless stated in the contract and it wouldnt really be a replacement at that point. One of the reasons you get a replacement install is so you can keep the original moulding . Unless its rotted and in very bad shape, the interior and exterior moulding stay.

If you want it changed, be prepared to pay a lot more money.

Replacing windows does not mean you are getting inserts or full framed /nail fin windows. There are few different methods of instaliing windows,which is best for You depends on different factors. It is important to understand what you are getting and to have it all in writing. A good will explain things in detail followed up with a written contract that states what they explained.