I have lots of guitars with original P-90's in them, 2 Les Paul Standards, Les Paul Junior, SG Junior, Les Paul Special and also several guitar with BK P-90 and MQ variants. They all sound different, in some it is subtle, in others it is more obvious. Just because a sound works in one guitar doesn't mean it will sound the same in another (a great case in point would be my 2 Les Paul Standards, one is an original 1954, and the other is a 1971 reissue, they sound similar but you can also easily tell them apart - if that makes sense!).