Yes, draw it to relevant attention.
Not least because if its a mistake the authors should have a chance to fix it; if (more likely) it isn't then who knows what the implications will be, down the line, of dishonest papers. People could spend years of their life doing work, only to find its invalidated and wasted, because underlying material was unreliable. Or, you don't say what the field is, but real harm could arise in many cases. People getting hurt or at risk, due to faked or inappropriately copied material (do you know what a plagiatlrist - a dishonest academic writer -will do next?!). Businesses and products based on these in part,not knowing the authors are dishonest.
You may want to consider best ways to disclose - who to tell and how to best approach it. This falls under academic whistleblowing.
But that's a different question.
Should you make the publisher, or some other relevant academic/s aware, in some suitable way - absolutely. Even if at worst, its simply an anonymous post showing the 2 papers side by side so it's unmistakable, and a link sent to various places where it'll do good.
(I don't necessarily know if that's the right way, but I use it to show that even if fearful of repercussions, there's a way. You need to ask how to disclose, too, but that as I said is a different question.....)