Before using WaniKani, I was using KanjiDamage to learn Kanji (which is a good method, it just needs better software - anyway).
Today in WK I learned 交ぜる. In KanjiDamage I learned 混ぜる. AFAIK both mean “to mix” and they even have the same reading. What’s the difference between these two? When do I know which one to use when writing?