It would depend on what exactly is in the terms of use for that pack. If it allows it to be used in any engine, sure. But, I have no idea without knowing what the pack is or how it's EULA reads.
Hope I havn't already asked this. Will there be a resource section for this on the forum and be able do similar things that we do with rpg maker, like making edits, what nots, and resources stuff for people