In both Yukon and the NWT, members are allowed to have outside interests but ministers may not—subject, however, to some discretion in NWT and the commissioner to allow certain things. Usually that's done for non-profit things and so on.
The previous work might create a need to insulate the member or the minister from certain things that they would otherwise do, because it might create a reasonable apprehension of conflict. In NWT and Yukon, there are provisions preventing former members from doing certain things for certain periods of time.