Though there is no way to know for sure if this Sichfrith and the one mentioned in the Irish Annals are the same, it is certainly plausible, and it is likely that there was contact between the Viking kingdoms of Northumbria and Dublin during this period.
Aínda que non hai ningunha forma de saber se este é o mesmo Sichfrith mencionado nos Anais do Ulster, é plausíbel, e é moi probábel que teña habido contacto entre o reino viquingo de Northumbria e de Dublín neste período.