Shelf Analysis: Ivy vs. Tantalize

I have purchased two books over the past few weeks that have something in common.  It won't take you too many guesses to work out what!

Ivy by Julie Hearn

Tantalize by Cynthia Leitich Smith

Is it the exact same stock photo, or did they just use very, very similar models?  Who knows.  But it is worth noting that that is the UK cover for Ivy - the US one is totally different.  Why change the book cover to make it look identical to another?  Yet another publishing mystery never to be resolved!