Linux distros tend to use the GNU userspace utils (or busybox on embedded systems), while The BSD family uses their own (IIRC, a descendant from the old BSD lineage).

The main difference - as I understand it - is that the BSD variants are strictly POSIX compliant, while GNU tools decided to diverge from that behavior (see: POSIXLY_CORRECT, other compatibility flags) for better usability, more features, and so on.

So, if anything, it is GNU that is "different" and "incompatible".

(Not necessarily a bad thing, mind you)