1) Importing URLs to a project makes sure that each of the URLs is processed by the project and submission happening almost in sequence.
2) Importing URLs to the site list will put them categorized by platform/engine. Meaning the project will not see some of the imported URLs as obviously it will not use all engines. It will also not submit to all of them at once or in sequence but only a random number of the URLs are taken from the site lists and submitted before taking another random amount.
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