After testing over a dozen different laptops with the GeForce RTX 3060, users can expect up to a 19 percent performance decrease between the fastest and slowest models currently available. There's a catch, however, as real-world gaming performance on the 70 W GPU can be brought closer to average by opting for a newer CPU with higher or faster RAM.
https://www.notebookcheck.net/Dell-XPS-17-70-W-vs-130-W-GeForce-RTX-3060-How-much-slower-is-it-really.551341.0.html