I have to call bullshit on this.
Shock horror! Fantasy book covers and they both show kings on thrones. Whoever heard the like? Next they'll be having hooded men on the front. My advice is for every author with a hooded man and sword combo on the front cover to sue all the rest.
I mean, the king on a throne motif is such a novel one - I just can't think of anyone ever using it befo-- oh...
One can probably plot a fairly unbroken line of king-on-throne covers between that one and these: