Not exactly, but I think you could mount your Fedora disk image in the CentOS one.
Edit the CentOS profile and set /dev/xvdc (assuming that is unused) to the Fedora disk image.
Now boot into the CentOS profile and mount /dev/xvdc somewhere:
Code:
mkdir /mnt/fedora
mount /dev/xvdc /mnt/fedora
cd /mnt/fedora
You should see your fedora stuff in /mnt/fedora now. When you're done, unmount it (umount /mnt/fedora) and edit the CentOS profile so it doesn't include that /dev/xvdc device. As long as you have enough disk space, you could keep the Fedora disk image around for a while until you're sure you've got everything.