4331 ISR Chassis

[PhilS]

Can a Cisco 4331 ISR Chassis equipped with an AC PSU, accommodate a DC PSU, or are they different chassis types? 

[Spooster IT Services]

Hi PhilS

4000 series routers support a variety of power supply configurations. The power supplies are field-replaceable
and externally accessible. The Cisco 4331 ISR power supply is not externally accessible, it is inside the
chassis.
The Cisco 4451-X ISR and Cisco 4431ISRs support dual, hot-swappable power supplies.

Below Table summarizes the power options

 

[Leo Laohoo]

Same chassis.  Different PS models.  Hot swappable.