We would like to sand and varnish the floorboards in our victorian tenement flat. After taking up the carpet we have discovered that a large section in the middle of the floor have been replaced which boards of a different width. If we sand it down as it is will it look uneven? if so, can we replace a section of the floor without it still looking like patchwork? and Is there an inexpensive way to replace the boards and have them as a good match to the others?