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That depends on how you define compatible. They are in compatible in the fact that if you were to install Dark Hope's HD alien skins with the K1 Alien Pack her skins will appear. But they aren't compatible in the fact that the newly added aliens will be in the vanilla quality. So you'll get these: Side by side with these: However, the installation is modular so you can chose to not install the Duros and Ithorians so you can get, for example, Echani and Devaronians but not the Duros and Ithorians.