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@Regal
It is similar - and I'm not 100% sure. My thinking was the headtube is called bi-laminate because it's fillet brazed to a tube that is then cut away to form a sleeve for the actual headtube, rather than being fillet brazed to a sleeve or lug that is already in place (which is how the seat cluster was done AFAIK). You're right though, the end result is basically the same.