Upgrade of Vaal Supporter Pack query

Would like to clarify a few things about upgrading my current early access support pack not sure if anyone can help me
I currently have the Thaumaturge of the Vaal Supporter Pack which I purchased for my Steam account however I would like to upgrade it to the Liberator of Wraeclast Supporter pack and use one of the keys for my PS Sony account is that possible and can anyone tell me how?