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Depends on "how accurate" you have in mind.

 

As to the 43 vs 43P: if you set the 43P to read average power (i.e. the PEP kit is turned off), they should be within ±5% of the full scale range.  That said, one of them could be, say, 4.95% HIGH and the other 4.95% LOW, and they'd both be within the manufacturer's specified tolerance range.  However, at 50 watts full scale (for example), the one would read 52.5 watts and the other one 47.5 watts (rounding). 

 

Which one would be right?  Both of them.

 

You couldn't use the 43/43A on SSB and expect to see PEP shown with any degree of accuracy or precision.