What is the difference between the Samsung S5 g900F and the Samsung Korea S5 g900f, besides $20?

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what is the difference between the samsung s5 g900F and the samsung korea s5 g900f, besides $20?

i was looking to buy a samsung galaxy s5 G900F and i noticed that amazon has a samsung s5 G900f and also a samsung korea s5 G900F and i noticed the korean version is often $20 to $40 cheaper and i was wondering if the korean version is authentic? and how is it different? performance wise and features wise.

thanks