I'm thinking that both of these versions are authentic MLP accessories.
I recieved the first edition Sweet Shop for Christmas when I was 6 or 7, but my mom got rid of the playset part and most of the accessories (I still had the apron and hat, a few sodas and a chair) about a year later. So, when I was about eleven or so I saw the Sweet Shop and some other playsets on clearence at a Toys R Us and my Grandma bought them for me. I still have all of these with practically all of their accessories. I never really had any other toys that the apron and hat could have possibly come with. Besides, I have the "old apron set" and then another apron set that showed up in my accessory stash after buying the later edition of the Sweet Shop.
While I can't swear that I remember taking that apron set out of the plastic bag while de-boxing the new Sweet Shop, I can say that I had one set before getting that playset, and after opening it I had two...
Hopefully, that helped sheds some light on this.
Sweet Tune