So now are there any differences between J-Pop and K-Pop or are these international musical genres about the same?

Dude...

Do you know what J-pop and K-pop mean?

Japanese pop music and Korean pop music. The biggest difference is the language. If you pay attention to what they are actually saying. There's a difference.

One is Korean.
One is Japanese.
Derp xP

It's pop music (although other genres fall under Kpop and Jpop too). Pop music has a similar sound wherever you are in the world, only difference being the language being spoken.

Sometimes a deciding factor in people's preference between Kpop and Jpop lies within the visual side of music videos, because both genres put an emphasis on the visual portrayal of the music whether that's set, dancing, outfits etc.

Correct me if I'm wrong; K-pop puts more emphasis on dance then J-pop does. And I think J-pop has...stranger visuals. I also believe that J-pop tends to be more cutesy than sexy where as K-pop is the reverse.

But this is only based on my (probably) limited observation.