Can I use Apple 70W USB-C Power Adapter with my iPhone 16 Pro Max?

Yes.

You can use any larger power adapter. The phone will not draw more power than it was designed for no matter how large the power adapter.

Also see: Fast charge your iPhone - Apple Support

No. It will not cause any problems no matter how large a power adapter you use. The iPhone will not draw more power than it is designed for no matter how much larger a power adapter you use.