Keeping free linux containers with macOS plans

I’m currently using CircleCI with a free linux plan.
One of my new repo requires running on a macOS platform. If I subscribe to a “Seed” plan for building on macOS, will this add to the free linux plan (with the 1500 min/month), or replace it (with only 500 min/month) ?
It’s not clear from the Pricing page whether or not I will still have access to the free linux box for building my existing repo.

Linux and OS X plans are handled separately, so adding or changing an OS X plan will not affect your Linux plan.