For your Macbook Pro, the Mini DisplayPort Luna will work.
It plugs into the Thunderbolt 2 port.
Mac and iPad can be connected together by either USB or wifi connection.
Difference between the USB-C and Mini Display port Luna is the connector type.
Most recent Mac models only have USB-C / thunderbolt 3 ports.
More information on Mac ports is available here from Apple Support - https://support.apple.com/en-gb/HT204154