Can I rent out an existing 10-day reservation at HGVC resort other than my home resort?

I have an existing Hilton Grand Vacations Club (club points) reservation (1 bedroom; sleeps 4).

It is 10 nights duration. It is NOT at my home resort.

Is that something that I can rent to another person through RedWeek?

Contact HGVC to confirm that you are able to rent your reservation obtained with these points. As long as your timeshare company permits you to rent the time you obtained, then you can certainly post it for rent on the RedWeek website.