Two different things blud.
Afterlife is different and death is different.
Owner of enma and king of hell is same thing.
What does ashura has to do with Afterlife
He has nothing going on. For him for afterlife.
You're a special type of thick, aren't you?
Zoro is symbolically tied to the Afterlife, or more precisely to the Underworld, which is merely a side of the Afterlife (more or less half of it, depending on the culture of reference).
Zoro brandishes a sword called Enma, who is the Judge of the Japanese Afterlife.
He has a power-up he himself named Asura, who are the mythological Hindu demons opposing the Devas, or angel-gods. I mean, the dude literally turns into a three-headed, six-armed monster holding nine swords!
Also, the three-headedness of it also connects to hell, as a subtle reference to Cerberus, the guardian of the Greco-Roman Afterlife.
During the Asura form, Zoro even uses various techniques with overt references to hell, such as Jigoku-bakkei Mōja no Tawamure (地獄八景亡者戯, "The Eight Scenes of Hell, Jest of the Dead")
King of Hell is a different technique from Asura, a more powerful haki-infused attack staking the hellish royalty symbolism
on top of the demonic one.
He has met the Soul Reaper, albeit it as a hallucination.
What the fuck more do you need to see the link between Afterlife and Zoro's character?
Having a character built around certain references and connection does not mean that it has to be what the character believes in. Luffy has already declared that nobody should act as a deity, yet he has a godly DF. Similarly, Zoro doesn't have to be pursuing a path to hell for him to be connected, conceptually, to hell and its Eastern connotations.