Thoughts on Archaon Lord of the End Times?

What are people’s thoughts on using the Archaon on horse model in place of the Archaon on dragon model (Archaon the Everchosen)? Is it reasonable to use the Everchosen warscroll? I know I need to keep the same large base if I were to use the older model, but I wanted to see what others thought if I were to use this model as a proxy for the Everchosen model and still use that warscroll in matches.