iPad 2021 Charging Power

Yes you can, without harming your device/battery.

See this page, and click on "Compatibility" section at the bottom:--> https://www.apple.com/shop/product/MY1W2AM/A/30w-usb-c-power-adapter

Regards

Giulio

You can safely use the 30W Power Adapter - but your new iPad Pro will charge no faster than when using the supplied 20W Power Adapter. Both the Apple 20W and 30W Power Adapters support USB PD (Power Delivery) Fast Charging. The iPad Pro’s maximum supported fast-charging rate is 18W (i.e., 12V @1.5A or 9V @2A).

The 30W Power Adapter is useful when you are using an external hub or other powered accessory that provides USB-C Pass Through power - as you have additional power for connected accessories.