will the Map Pilot Business app work until the end of 2021 if you download Map Pilot Pro? will these two apps work separately on the same tablet?

Map Pilot Business and Map Pilot Pro are two different apps that are not related. Map Pilot Business has not been updated for over 8 months and certain features have stopped working as was expected. Map Pilot Pro uses some different services that have different terms and will be the app to use moving forward. 

You are free to continue to use Map Pilot Business as long as it is functional for you. They can both be on an iOS device at the same time.