To be honest I would read the terms of the asset. See if it says anything, and use it if it doesn't say anything about mixing gumroad and booth.
In other words if it says nothing, you're safe there is no ban, but people may turn their head to you because they disagree with the action you took.
Personally I think you should do it. I think it'd be really cool to see!
(and no we don't strictly stick to communities, i've mixed things personally with booth and gumroad lol)
