Do other cats have this feature???

My 4 month old gray classic tabby kitten (mother is Russian Blue, no idea who father was) has a spotty tummy but what is odd (to me) is that the tummy area has a mid llne in her fur so that it looks like the fur was put together from two haves instead of one sold swath of fur. I have never seen a kitty tummy that looked like that. I also want to mention that her fur markings are extremely symmetrical, down to the smallest detail. We even joke that she looks like a Rorschach ink spot due to the symmetry on both sides of her body. Has anyone else noticed such a line and is it indicative of any particular breed? Thanks.

Yes.  My Emmie has a midline down her chest and tummy.  She's got a white tummy and you can really see it when she stretches out.