Usb-C to lightning cable to connect keyboard to iPad

Lightning in Lightning and USB-C in USB-C should be (damage-free) fine.

Working or not being another discussion.

You’d need a dongle or two to connect that iPad to a USB-whichever keyboard.

Or use Bluetooth.

Apple has some options, as do other vendors…

https://www.apple.com/shop/ipad/accessories/keyboards?fh=35d5%2B4d0d

Various iPad Pro models have a USB-C socket.

Most (all?) iPad models have Lightning socket.

Identify your iPad model - Apple Support

Apple sells a USB-C to Lightning cable, with a USB-C connector and a Lightning connector.

Apple also sells a USB-A to Lightning cable.

Many keyboards have USB-A connectors, some have USB-C connectors or USB-C sockets, and various Apple keyboards have Lightning sockets.

If you’re mismatching connectors and sockets, then yes, that can cause hardware damage.

As long as the USB-C connector went into USB-C on the iPad Pro and the Lightning connector into the Lightning socket on the keyboard, prolly no damage.

I’ve used the keyboard charging cables with a Mac with no issues. That’s the set-up and keyboard-charging configuration.

If this is a battery-powered Lightning-connected Magic Keyboard model keyboard that uses Bluetooth, try charging the keyboard and connecting with that.

iPad usually uses Bluetooth or smart connector for the keyboard.

Prolly won’t break the hardware, but whether the Lightning-connected keyboard will work?