TPS53667: the TPS53647 (4 phase) and TPS53667 (6 phase) are P2P solution. May we know what different between these 2 device?

Part Number:TPS53667

Hi Sir 

the TPS53647 (4 phase) and TPS53667 (6 phase) are P2P solution. May we know what different between these 2 device?

The customer request around 120A output, which one much suggest?

If TPS40425RHAR/TPS53667/TPS53647  all can use CSD95372BQ5M and CSD95490Q5MC power stage? 

I think it is ok, just impact efficiency. or something i have need notice? pls advise.

                                                                                                            Bogey