Not the same. In fact, I'm not sure what Smart Motion is, maybe smooth motion? If that's what you mean, then that is just a post processing gimmick on a TV that uses software to try to make motion smoother, but often it's not worth using.
Variable refresh rate is the ability for your TV to change it's refresh rate to match a game's refresh rate in real time. This eliminates screen tearing and graphical glitches.
It's really a game changer for gaming. If you are looking for a TV for gaming, I wouldn't get one without it.

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