At a first look, I would think the same you did first: in the first sentence the speaker is not sure about if the invited person will come, or at least much less sure than in the second case. They are just two kinds of conditional sentence: the second one looks much more like a first-conditional one. (You could check on an english book, try looking for "first conditional" "second conditional" and "third conditional") The answer to the second question is yes: both sentences are considered conditional.
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pleasehelpWhat's the difference between these two sentences?The meanings of these two conditionals are nearly identical. Ninety-five times out of 100, people will choose the first one.