only one bleed source is permitted to operate one A/C Pack. Don't know about the Douglas or Lockheed, or Airbus.
Not all Boeings...
In the 747 (both Classic and 400) 2 packs can be run on a single bleed source, even the APU. Also, in normal operation, bleed sources are not isolated, so all 4 engines supply air to a common manifold.