Sure are, Generally the latest orders will be fulfilled with the current blend, unless the doll body is still held in factory or warehouse inventory, and that would be the blend at the time of manufacture.
So, if you get advised that you have to wait at least 14 days while the doll is made, you get the latest tpe premium blend if going through a reputable reseller.
Some smaller models are made with diferent tpe blends, as are some of the more unusual or fantasy toned models as this is the standards of the "recipe" or tpe blend formulation for that specific model.
Additionally premium model tpe blends are superior and different to the basic or local china domestic market models blends (as in the ones you guys see a lot cheaper on Amazon or Alibaba, or DHgate for example).
Sandro from Doll Studio has also just recently posted a tpe vs maker softness topic as well that is worth a look as it evolves too.
http://dollforum.com/forum/viewtopic.php?f=227&t=93805
I am going to discuss evolving the concept and database into actual brands and models for softness and durability ratings as well down the track once more data is collected, so this will indeed give you more definitive information regarding the blend for the maker and the model.
Anung