I take a "transformative" stance when it comes to using other people's assets where it's fine if it feels like you are using the assets purposefully and not just stealing someone else's work and passing it as your own. Now, "legally" speaking I don't think this is the case, but I highly doubt industry lawyers have got eyes on Indiepocalypse nor do I think an overexcited game site will inadvertently snitch on the zine.
Basically, don't worry about changing anything. Worst case if it's in the zine and someone gets mad we could worry about replacing it then. Forgiveness instead of permission and all that.