Replacing portion of hardwood floor

centralsquare

We had an unfortunate fire and part of the 20 year old red oak hardwood in a couple rooms have been burned (either due to the fire or due to falling ash).

My question is: if we replace just what was damaged with new red oak, will it look the same as the older flooring. Or does all of the flooring need to be redone to ensure that it matches?

We do not plan on staining the red oak (it isn't stained now); we will just have urethane put down.

Thanks!