"I should have died in those ash wastes, but Lord Vivec must have seen something inside me that he hadn't seen in millennia and decided to spare me from my fate."
Not only are they visually similar we know Teldryn Sero was around for the morrowind events and he's met Jiub (first person Nerevarine meets). And apparently the Nerevarine went off and disappeared into hiding, Teldryn in game only wears helmets that totally covers his face