In America, unfortunately, they are not virtually the same thing.
In this case, and in many other cases I've seen, there's no assault. There's no hint of assault. Any form of non-cooperation with cops is "resisting". As they try to shove you in one direction, do you brace you muscles? That's resisting. If you say, as this man did, "Get your hands off of me", that's resisting. Do you let your body go limp so that you must be carried by the policeman? That's resisting. If they feel like the "have to" Tase you to get your full cooperation, that's resisting. If you get really mad after they just tased you, that's resisting. If you demand to know what charge you are under arrest for? That's resisting.
Oh.....and those Miranda rights we hear so much about on the cop shows....they don't need those, either. I'll have to look up some things, but I don't think they even need to say the magic words, "you're under arrest". Did they in this case? I'll watch the video again.
ETA: Yes, they did, at some point, say "You are under arrest", but he was under arrest for resisting arrest.