I doubt so ,his poison is late to kill .Sasori's poison takes three days to kill you on its own. Considering Orochimaru could use Oral Rebirth before his body was burned to a crisp by KN4's shroud (something that took a few seconds at most) I'd say that he can easily escape the poison.
Oral rebirth can't escape poison... He can shed his skin, but the posion enters his blood stream and affects his organs, his veins etc.. something he can;t shed