Almost all smart switches need a neutral. The wiring is different because a smart switch is really still on even when it looks like it’s off, or it won’t recognize the next command to turn “on” again.
See the following FAQ on wiring:
So you want an automated hardwired light switch, but you’re not sure where to start. Well you’re in the right place. The most common requirement of any hardwired automated light switch is a neutral wire. Yes, there are a few…(read very, very, very few) switches that don’t require a neutral, but those will limit you to incandescent only. For those of us using LED, Fluorescent or some other energy efficient bulbs under 20w a neutral is REQUIRED!
So what does this look like?
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This is a diagram of a switch with the neutral run directly to the light. This is not good for automated hardwired light switchs and i would HIGHLY recommend that if you want to automate the light, contact an electrician and have them pull a neutral for you. It’s not as expensive as you think and will save you…