I feel like this quote is one of the most underrated thematic moments in the sequel trilogy.
When Maz says, "You see the same eyes in different people" the line makes sense on the surface in the context of her conversation with Finn. However I think there's a broader thematic significance to it that goes beyond that immediate context.
One interpretation is that people can have similar motives and intentions, even when they try to disguise them behind different identities or justifications. That already applies to this scene but I think it's also very true in reality.
Another is that different factions and political movements can present themselves with entirely different imagery, messaging, and rhetoric while ultimately embodying the same underlying ideology. I think the First Order is a great example of this. They have refreshed aesthetics, more extreme superweapons, and increasingly radical rhetoric, but at their core, they're still neo nazis who idolize the Empire and its power. Despite the new appearance, the underlying authoritarianism and desire for domination remain the same. And to a different extent, factions can market themselves as something else while still being nefarious at thier core.
Anyways just wanted to share my thoughts!