Vegan butter and margarine are similar but not the same. Margarine has a really distinctive flavour and a really soft texture that is not like traditional dairy butter. It is also not always vegan. It often contains milk derivatives amongst other things, even the ones that are sometimes labelled as plant-based" so be careful. Look out for ingredients like whey, lactose and casein. Also be wary of lecithin and vitamin D3 which can sometimes be derived from animals. My vegan butter recipe is more like dairy butter in flavour and texture than store bought margarines.