I just installed the ES version on my 2013 non ES FJR. I wanted to have a part that would fit an ES should I upgrade to an ES in the future, so I asked MV whether an ES would fit a non ES bike. They replied saying the ES would fit all FJR models, and it fit perfectly. I could see MV selling only the ES version once their non ES stock runs out, but that's just my speculation.
The install was easy, in part due to the excellent main thread here on this forum. Great bit of kit, easy install and works as advertised. Still can't believe it was delivered from Germany to my door in Canada in 3 days. Cheers.