New site, preventing duplicate content from old site
I have a relatively young site (site A) which has been indexed by google. Sadly due to a change in company names, I have had to create a newer site (site B) with a different URL but which has exactly the same content.
Before I submit site B to google, what is the best way to avoid being penalised for duplicate content? Do I need to alter the robot text on site A?
Thoughts and suggestions appreciated as always.