Is your room the same view type? They might let you stay in the same room if it is the same category (ocean view, garden view, etc.) It it's a different view expect to move on the last night.
Also, is the room the same "type" (i.e. 2 bedroom, 1 bedroom, general room, etc.) If you are paying for a general room and your timeshare week is for a 2 bedroom unit, I could see them making you at least move out of the 1-bedroom portion.