Hi,
We bought some floor tiles last year from Terrapilar in Cartegena we got them for the Bathroom when buying they told us there could be a slight difference. There was a massive difference the colour was spot on but the vein in the tile was really prominent. I am glad that we replaced them all otherwise it would of looked silly.
If your not going to replace them all I would check all the other tiles 1st before starting to replace the damaged ones. The best way to do it is get a kids hard bouncy ball and bounce it on each tile you can tell by the hollow sound which tiles will need replacing. This is due to them not putting enough tile adhesive down.
Sorry if this is bad news but hope it helps.