Sign Upwork contract when having a CrowdGen account?

Hi, I wanted to know if it's possible to sign a contract with Appen/CrowdGen on Upwork if we already have an active account on CrowdGen and working on several projects.
(Country: Italy but I don't think it makes a difference)
I know that creating multiple accounts is forbidden, but I was wondering if anyone experienced this situation.
(I guess it would be possible using the same account, with payment being processed differently)
Thank you!