I mean, I guess? Fraternal twins can become fused on a cellular level, a condition called a "chimera twin" (an very fitting title in this case ) but the condition looks nothing like conjoined twins or parasitic twins.
It's basically one person who possesses two different types of DNA in their body (one belonging to themselves and the other to their "sibling"). They usually look like a regular person and many people who have the condition can go decades before being diagnosed with it, if they are ever diagnosed at all.
But these are fictional gods, so you could say they are a godly form of a chimera twin if you want.