No, a smart DNS is completely different from a VPN. A Smart DNS connection will only change your DNS settings and make your Samsung TV appear as if it’s connecting from the location of the server you’re connected to. A smart DNS does not encrypt your traffic (like a VPN does).
A VPN is a service that changes your IP address and encrypts your traffic. This way, it hides your location and prevents anyone from spying on your online activities. All the VPNs I recommend provide access to a smart DNS, making it very simple to switch between the two tools depending on your needs.