Yeah, even dogs and wolves can breed, and it would be weird to say that they are the same species.

Not the other commenter but basically they want the previous ruler gone and replaced with someone else. Sometimes it turns out that the someone else is pretty shit. You don't want them, but you don't want the previous guy either. So you're stuck with someone you don't want, but you don't have the energy, willpower or economic stability to get rid of them too, at least for another couple of decades or until some nice foreign agency wants to install someone new, who you also probably won't like.

In democracy, this happens every four to six years with the revolution condensed into a couple of years of adverts, rallies, and the media telling you who you should or shouldn't like. Then you make your choice with the end goal that hopefully you got the least worst choice, and hopefully that guy you did have who you didn't like is gone. Or if the guy you didn't want gets in, you can complain for four years until you can try again. Meanwhile, you don't have any real power and which guy you choose is meaningless as they're all the same anyway.