I just got some of these too, more than likely same vendor. Usually Etilaams but spotted the colour difference with these immediately, I did once get a batch from this vendor that looked like etilaam on the outside but noticed (or rather the missus did) that my mouth was blue (I always subligual etilaam as I like the sweet, slightly minty taste) so I cut one and it was blue right through.
I chopped one of these the minute I saw the colour difference, saw it was white in the middle so shrugged and chucked a couple under my tongue expecting the usual mild taste but it was sour as fuck, like lemon juice level sour. Straight to the bathroom, spat them out and rinsed my mouth out, I am going to wait an hour or so and see what happens because some absorption will have occurred. I am convinced I can feel something 10 minutes in but it's probably just my head fucking with me as I was obviously a bit worried with the totally different taste although if these were bad I'm sure there'd be more noise by now.