A Feed Me Pro license is valid for a single installation of Craft. If you want to use it on more than one site, you'll need to purchase additional licenses.
Yes. When setting up your feed, you're able to select the locale you want to import your feed content into. This will import your content into only this Locale, leaving others untouched.
For multiple Locale's, you'll need to create a feed for each locale.
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Available for Craft 2 & Craft 3, with Free and Pro versions.