They were launched at the same time I think. The picture of the suit above isn't showing the entire tag. The PZ Lanvin used to use the old PZ tag. Now they've switched over to the newer one as well. I've been to two stores that carried Lanvin and they had tailored items from both companies. The best indicator is the MSRP. I'm 100% positive on this.
But yeah, I don't see the logic behind using two companies.
Here's one with the newer PZ tag:
I'm sorry but none of this can be true. Yes I agree they obviously had separate manufacturers, cheaper line and then premium line, many of the Couture houses do this. There are shitty Gucci by Zegna suits and then really nice ones, or there are Hermes by Belvest and then Hermes by Cifonelli. However Those tags, none of them are Zileri tags, from now, tomorrow, yesterday, or 5 years ago. Second, why would they contract to Zileri to make their lower tier product? That makes no sense. Zileri makes Zilli Suits, they aren't scrubs, and the Sartoriale line is one of my favorite lines out there. But the problem again, is that those are not Zileri tags, new or old. And these especially did not come out at the same time because Zileri tags would be evident then and then are not. This is a contracted firm to make baseline Lanvin suiting.