I work for a fairly large company that sells widgets online. They decided to sell widgets under a totally new company name as well. The benefit is that they can list some different products, although most will be the same, and can advertise in different places and charge different prices. They wrote an entirely new website for this purpose.
My question is: will the launch of the new website adversely affect the SE ratings of either the current website or the new one?

The look of the sites is totally different, and neither links to the other, but the content on a product level is the same, since they use the same product information feeds.

How can we make the content different enough without rewriting all producted details, which would take WAY too long?

Thank you!