If either circuit had arc fault or ground fault (or both) it would trip if you tried drawing power from both. Which is going to include pretty much any plug outside or in a garage in the past 30 years.
Yes, it'd create a multi-path circuit causing the trip.
This (multi-path circuits) is not uncommon when homeowners try to wire up a smart switch requiring a neutral to a switch-circuit without a neutral (as most light switches actually only need to switch the hot) and so they "borrow" a convenient neutral from a neighboring circuit which causes it to immediately trip!
This (multi-path circuits) is not uncommon when homeowners try to wire up a smart switch requiring a neutral to a switch-circuit without a neutral (as most light switches actually only need to switch the hot) and so they "borrow" a convenient neutral from a neighboring circuit which causes it to immediately trip!