Nope leave them be.
If your ewes lose their tags you replace them with identical ones if you know the details, if you don't you replace them with RED replacement tags with your flock mark.
Each ewe should have (depending on age) a normal ear tag with uk # and individual #
AND a yellow EID tag. Lambs could be moved on a single slaughter tag, but if you are going to keep them you need to double tag