You should be able to swap the processors, since FCLGA1151 is pretty much the same thing as LGA 1151. Just look up a guide on youtube about how to install an Intel CPU and a 5 minute youtube video will give you visual examples of how to do it. No worries about compatibility.
That being said it's not much of an upgrade. I'd say the only reasonable upgrade for 7th gen is up to i7 7700k, and minimum i5 7600k. That i3 isn't THAT much better than your current i5.