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If marketing/branding feels like they want all of them to be consolidated under the brand, I would go ahead and move forward, and just be sure to cover my typical site merger bases. From my experience, it ends up happening at some point, so you might as well take advantage of the extra press, etc. that is likely happening from the merger to get it right as soon as possible.

Hi! Thanks for reaching out. The Mozscape API will provide you with link and URL date, but not ranking information. I recommend checking out our API Wiki for detailed information on both our paid and free API metrics and costs. Thanks again and have a great day! Best, Sam Moz Helpster