my floor tile has a crack so i replaced one tile with the same exact tile but but the new tile looks different how do i make the new tile look like the old tile
Are you talking about vinyl tile? If so, the old tile is probably discolored from age, and ware. There's nothing you can do about that, but you can take another old tile from a place that's not noticeable, like under a piece of furniture, and put it where you put the new one, then put the new one in the place where you removed the old one from, and it's not to noticeable. If you're talking about ceramic or clay tile, there may be a way to refinish the old ones to make them look new, but you'd have to check with a tile place to find out.
challenging step browse with the search engines just that might help
Try to select such colors which matches the old one so that looks same. If still not working then take help from experienced professionals.