No, these are apples and oranges. GDPR regulates what obligations a site collecting data of european users has (for example, acquiring consent). This imposed regulations on a direct, contractual relationship (whether the contract is implicit doesn’t matter here). Every party involved then has rights to sue if the agreed contract is violated. A US company providing service to US customers has no obligation from GDPR (but have fun making that distinction in practice)
US search warrants on the other hand basically circumvent local law. I, as an Austrian Citizen, have no way to protect myself against such warrants if I decide to put my data in, let’s say, office365, even if the physical location of my data is within Europe and the actual operation of the Servers is handled by a different, European company.
In my opinion, this is nuts. The US should have to go through the same channels for foreign police assistance as everybody else.