Also would depend on what you mean by full grown? Butcher ready 250lbs pig likely not, our breeder pigs ranging between 600-800+lbs would be over them in a hot second. We use cattle panels for their outside pen and they could get over those if motivated and if they had not rooted up their side and made it a foot lower. Pigs never stop growing so "fully grown" isnt really a thing for pigs, to be fair they will greatly slow in growth at around 12 months old.
If you are raising to butcher you should be good with hog panels or if you are raising a smaller breed like kune kune or idaho pasture pigs. If you are raising any of the large breeds for breeding, might as well just start off with cattle panels or train them to electric if you have a sturdy perimeter fence.