well, come round means visiting someone in their home, while come over is to come to a place (general) or to move from place to another.

In the sense of "visit", the basic meaning is the same. However, what difference do you see between the words "around" and "over"?

You're right both can mean to visit somewhere: for example, 'why don't you come around to my place later?', or 'can you come over to my house later?'. In that context they are literally the same and completely interchangeable. However to 'come around' also has another meaning, which is to change one's opinion and see something a different way: for example, he finally came around to liking spinach after years of me telling him it was good. Hope that helped buddy :)

come over invitar when you come around to my way of thinking you will be my friend.