WR Exhaust Header interchangeablity with YZ?

I have a 99 WR400, with a 426 top end. I am currently running a stock head pipe with a Leo Vince x3 slip on. I know on the 450's the YZf header is better, is this true with the 400/426?

And if I were to buy a YZf header would it fit into my Leo Vince?

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