No, isomerization is not a reforming process, but it is often carried out in conjunction with reforming. Reforming converts naphthenes into aromatics and also isomerizes alkanes. Isomerization specifically converts straight-chain alkanes into branched-chain alkanes. Both processes aim to improve the octane number of gasoline, but they achieve this through different chemical reactions and typically operate on different feedstocks or different parts of the same feedstock.