Import blog posts multiple times

Hello,
I’ve imported blog posts a few months ago from my shopify to my WP and all went great.
I wanted to import the rest of it since the first import but I was wondering : will it “know” which posts have been already imported and import only the ones I didn’t import (keep in mind that I’ve modified some imported posts on WP since the first import) or will it import again all posts ?

thank you !