A330/A350 are a common typerating, depending on the authority you need a kinda extended differences training, pretty much as between the 787 and 777 as well. As the Airbus types can be flown in SFF and MFF at the same time, flying A320/A330/A350 in MFF is both legal and possible, i heard rumors that Finnair did that, no idea if they still do or if they changed it to A340/A330/A350.