Yes, the MGP and PP4 style circuit breakers fit the beige and cream coloured Powerpact 4 panelboards. MGP breakers will fit in the Powerpact 4 boards present MG#C# ( Cream colour ) style and the older MG6P# and MG8P# ( Beige colour) style boards.
For the MG2P boards, need to use adaptor kit MG2APNS with the ComPacT NSX breakers.
For the MG1P boards, no adaptor available.
For the MG2P boards, need to use adaptor kit MG2APNS with the ComPacT NSX breakers.
For the MG1P boards, no adaptor available.