Samsung Power Adapters often feature the QC (Quick Charge) standard; QC is not supported by Apple devices.
Many Apple devices, such as your 2020 iPad Pro, support USB PD (Power Delivery) standard - and will fast charge your iPad. The iPad was originally supplied with a 20W USB-C Power Adapter - and will charge the iPad at its maximum supported charging rate. Higher powered Power Adapters can be used (e.g., the Apple 30W USB-C) although will not charge the iPad any faster. Higher powered Power Adapters are useful when powering other USB devices whilst charging the iPad via a USB Hub or other adapter.