Minecraft Mod Compatibility? - 1

I'm playing Minecraft on my Mac. I just got a bunch of mods installed using Minecraft Forge, but 2 of them are having conflicts, and I don't want to get rid of either.

They're Galacticraft and Natura.

I want to go to space, but have awesome trees at the same time. These 2 are conflicting with each other, and I don't know what to do about it. I saw on the Galacticraft forum that you need to change some code for them to work, but I have no idea what I should change. Does anyone know?

Note, I'm using a MacBook Pro, and my MC Forge version is 1.6.4

You will need to know how to code java with the program eclipse which is not easy sorry.

In alot of mods the config file lets you change ids