correct charger for ipad pro 11

Current models of iPad Pro 11” are supplied with an Apple 20W USB-C Power Adapter suitable for the region in which the iPad is sold - along with a USB-C to USB-C cable. These Power Adapters are compatible with all models of iPad - when using the appropriate cable (devices with a Lightning port would require a USB-C to Lightning cable).

For example, for the US market:

https://www.apple.com/shop/product/MHJA3AM/A/20w-usb-c-power-adapter

For UK:

https://www.apple.com/uk/shop/product/MHJF3B/A/20w-usb-c-power-adapter