Matting headers to midpipe ?

In the process of installing BBK shorty headers on my 03 Z06. Got the headers bolted down and went underneath to mate the midpipe.

Unobservant me didn't notice the factory manifolds are a ball type:


And the shortys are flat:

So here's how they line up under the car:


Any issues with these sealing once they are tightened down?

Matting headers to midpipe ?