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TPS548A28: Cff design formula

Part Number: TPS548A28
Other Parts Discussed in Thread: TPS54J061, , TPS548B28

Hi Team,

My customer is wondering why in the same Vin/Vout/Fsw condition, our recommend(based on the design calculator) Cff value will different from our P2P competitor MP8633 ?

We didn't the Cff design formula in the TPS548A28/B28 datasheet, but I do see the formula in our TPS54J061 datasheet as below,

Does TPS548A28/B28 can use the same formula in the design ?

Do you know why our suggestion some time will different from the MPS part ?