On the original question
If in Scotland, it can move on a further temporary paint maek.
If in england and wales, It is the herd number that neeeds to go onto the tag, not the CPH (nor your flock no. that you have for your sheep!), and yes this has to be from the holding that it is moving from ie your current number.
In England and Wales, a pig moving to over 1 year old comes under PRIMO 2007 (2008 in Wales) under part 3 regulation 7 which states
7.—(1) No person may move a pig off a holding unless it has—
(a)an ear tag with the letters “UK” followed by the herdmark of the holding from which it is being moved; or.
(b)a tattoo showing that herdmark (with or without the letters “UK”).
Regulation 6(c) states that
(2) A tattoo must be applied either by tattoo forceps, in which case it must be on an ear, or by slap-marking equipment, in which case it must be on each shoulder.
Once the pig(s) have arrived at the destination, they need no further ID to remain there, unless or until they move again, either to another buyer, because you move again(!) or they go to slaughter.
So tag with your current herd no. and nothing further needed.
Once you have moved, advise your local Animal Health, and you should be able to get your current herd no. transferred to your new CPH (assuming you get a new CPH - the rules on CPH's are far too complicated to go into here, and in most cases you'll go for a new CPH, or inherit the one that comes with the land you buy). Some AH's don't like transferring herd. no.'s so try and get you to have a new one.
Ambreil - your KK's are tatooed not notched - some breeds are notched (eg saddleback) and some are tatooed (eg old spots).
If pigs arrive under 1 year old, then they typically will not have a tag, NOR do they need one as long as they remain with you, only when they move from your holding.