The latter circumstance is rare, partly because the producers would typically have to wait out an exclusive negotiation window with the original network, and—especially in the 21st century—partly because of vertical integration (specifically, major networks ordering most of their series from companies under the same corporate umbrella).
It is rare for this situation to occur, partly because producers would typically have to wait through a unique negotiation period with the original network, and—especially in the 21st century—partly due to vertical integration (specifically, major networks ordering most of their series from companies under the same corporate umbrella).