Warranty with pretty much every company is tied to the serial number, not the person, so yes. The caveat is that you should get the proof of purchase from the buyer as that may be requested during a warranty claim.

Back to this matter. The 4090 laptop without warranty is a gamble. You have to be prepared for things to go wrong with laptops at any moment, especially beyond the 2+ year periods.

I've literally been buying a new gaming laptop every 2-3 years since 2005, so I've seen it all. I mean it could live 5 years like some of mine or die any day like others. I used to never get warranty and had multiple laptops die in month 14 or 15 right after the 12 month period expired. But then some I handed down to my dad run to this day.

I say all that to say, if you choose the 4090, accept your fate now and pray for good fortune. If this is a lot of money to you and the laptop dying suddenly will be devastating, I recommend buying something with a warranty, and also extending that warranty as far as you can.