Having spoken with Alan Costa, British publication MCV has confirmed Disgaea 5 Complete will release in the West on the 26th of May, 2017.
Costa is a Senior Associate Producer for Nis America and is reported as saying: “Both versions are the same. However, the Switch version features all the DLC from the PS4 version. We will definitely be emphasizing that all DLC can be found on the Switch version as well as highlighting that the game can be played at home or on the go.”
The mentioned dlc consists of new characters and scenarios and will be available on Switch as standard.