After testing over nearly 20 different laptops with the same GeForce RTX 3060, some are definitely faster than others by as much as 25 percent. It might be a good idea to see which ones to avoid if you're in the market for the fastest model out there.
https://www.notebookcheck.net/These-are-the-slowest-and-fastest-GeForce-RTX-3060-laptops-you-can-currently-buy.560771.0.html