I don't think so... I have some of their blushes including Bronze Beauties (if that's the one you were thinking about). I really like it, but it's shimmery and I wouldn't use it in place of a bronzer, but then again Laguna is shimmery as well. They're not similar in color at all though. Bronze Beauties, when swirled together, is reddish brown like Benefit Hoola, only more pigmented and shimmery. When I used to use Laguna, I remembered it being lighter and more caramely, with yellowy tones.
I love Bronze Beauties on my cheeks though! Still a good blush.
As for Milani's actual bronzers, I have no idea, I haven't tried them, if there is a dupe for Laguna from them I'd be elated because I know Milani's bronzers are matte