Can I downgrade from the Windows 8.1 preview to Windows 8 if I have an OEM CD?

The internet is full of vague information about how you can downgrade the Windows 8.1 preview to Windows 8, and I kind of want to try it, but only if it's not going to be too inconvenient to uninstall if I need to.

Here is my exact situation: I installed Windows 8 using an OEM CD. If I install the Windows 8.1 preview, can I use the factory restore feature to downgrade back to Windows 8? Does this change based on whether I installed using the Windows Store or the .iso?

If you take Windows 7 betas and what some people have reported about Win 8.1 preview, installing a beta copy is a dead-end street. No way to update to a full version once it is out, and no way to roll it back - a full reinstall needed. That's why there is the strong language about not using it on a production system.

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