Does a dual yoshimura exhaust have different sized holes just like on a stock CRF250R?

I own a 2006 Honda CRF250R bike which has dual exhaust which comes stock on the bike. For the stock dual, the left exhaust has a slightly bigger hole than the right because of making even airflows. MY QUESTION IS: I want to buy a dual Yoshimura from motosport.com, i'm not sure if they have different sized holes just like stock. And if they don't, does it make a difference?

Yoshimura have been making performance exhaust systems for many many years
And in my opinion probably the best in the world at what they do.
If you buy the correct exhaust for the bike I'm certain it will be correct in all aspects.