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Thanks for your response, besides content is there anything technical that should be done other than the 301s. I agree with creating unique content, certainly want to avoid a duplication penalty.

A client has two different sites selling the same products with the same content, they would like to replatform onto Magento while redirecting those 2 sites to the new URL. The question is, besides monitoring the 301 redirects is there anything else to take into consideration when consolidating two sites into one new site?

We are replatforming an ecommerce site and will need to change 90% of the urls.  Many current urls contain uppercase characters and the new system forces all lowercase.  We are concerned with submitting the urls all at once to google it might look like spam, receive some sort of penalty or negatively affect organic search. In the last month this site received 428k unique visitors, 3.2 mil page views and has about 10k urls.  They are a top 3 competitor in their vertical.

We are certainly planning to do all 301 redirects.

What can we do additionally to reduce the risk of penalties here?