You can just use one E-junkie account for all your uses of our system; it's not necessary to maintain separate affiliate vs. seller accounts. You can use the Sellers and Affiliates tabs at the top of our site to pick which Admin you want to see for your account at any moment.
If you would rather abandon the old affiliate account, you can just log into that old account and delete the PayPal email from its profile, which will free it up for use with your newer account. You could also add a Secondary Email to your PayPal account and just use that for your newer E-junkie account's PayPal Email setting.