In this context they're not the same thing. Calls from companies legitimately operating in the country need to obey laws or face enforcement (ideally, unless the government is asleep at the wheel) while calls from scammers outside of the country are breaking a bunch of laws anyways so who cares about violating a do not call list.

I consider marketing is a plague on attention and view it highly negatively - but in the case of tools to reduce unwanted phone calls there are some real differences in what's available to legitimate vs. scam callers and a do not call list can only ever be effective against people working within the system.