Will a 9.7 Smart Keyboard work with a 10.2 iPad?

Assuming you have a 7th, 8th or 9th Generation iPad, which has a10.2" screen, this is the keyboard you would want to buy:

Smart Keyboard for iPad (9th generation) - Apple

The 9.7 inch smart keyboard would certainly work, but WILL NOT completely cover the screen of your 10.2 inch screen iPad.