But that doesn't totally rule out him being a Stark variant, since variants do sometimes have different names.
That was what I am thinking. He is Stark but with a different name or I have also considered that Victor Von Doom somehow killed Stark from that world and somehow took over his body. Maybe they play with the idea that even though he isn't Stark he has retained some of that Stark's memories. Which makes it easy to help fool people into thinking he actually is Stark. Or what if he has even taken over the dead body of the MCU's Tony Stark and has access to his memories. We could see a Victor Von Doom who is conflicted because he has those memories of being a hero and has access to the feelings Stark had for Pepper and their daughter and his friends.