Assets downloaded for Unreal Engine vs paid subscription

Hello, I've been using Megascans for free with the Unreal Engine license. Currently I'm participating in the RenderMan challenge, so I'm considering paying for the Personal plan for use outside of UE. Will I be able to easily tell apart assets I "purchased" for free, for UE, and new assets purchased via paid subscription points? Or can I use all of them during my subscription?

Bonus question: the challenge rules (https://renderman.pixar.com/answers/idea/21735/art-challenge-explanation-6.html) state:

"When the Challenge is closed, all semi finalists chosen will be notified to submit their final projects. This will help us verify compliance with challenge rules. A BOX folder will be provided for submission."

I'm guessing submitting a challenge project, which uses Megascans assets, for review, would break license terms?

Thank you in advance.

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