Prostar heads valve seal question

I purchased a set of prostar heads for a 2000 5.9 engine.
In the picture below, the seal on the right is the ones that came on the heads. The seal to the left, I have from a rebuild kit.
Is there any advantage in swapping the ones on the left on the new heads?
Also, could you look at the last picture. That is with one of the kit seals installed. It does not go flat at the bottom. Is that a problem
Thanks