Can SCM-managed projects created in Pro be opened/modified in Unity Free/Indie?

Pro 2.6 added support for managing projects with external source control tools, and everything I've read makes it sound like a one-time thing that the Pro tool enables on a project. I understand I need to have a copy of Pro to make the project initially, but I'm wondering if that then requires everyone on the team to have Pro. Primarily:

1.) Distribution: Can a project created by Pro and checked into an SCM repo be checked out, opened, and used by the free tool?

2.) Contribution: Given #1, can the free client make changes to the project that can be checked back into the SCM repo without breaking anything for other clients (Pro or otherwise)?

1) No. Technically it doesn't work, and the Pro license forbids mixing of Pro and nonPro licenses on the same project.