As a general rule, yes, you can use any of our fullPage licenses on your customer website.
Learn which license should you choose depending on your project purpose.
Just remember that fullpage.js licenses are non-transferable. By definition, you will be the one who owns the license and that has the right to use it.
If your client/company wants to own the license, they should be the ones buying it.
You can read more about it you can check out the fullPage.js license terms and conditions.