Thanks Garg ji,
The primulaworld page for Primula boothii says
"Confusion exists as to whether this species is distinct or synonymous
with P. bracteosa. Both the Flora of Bhutan and the Flora of China, as
well as modern Nepalese accounts consider these species the same.
Primula boothii was originally found in Eastern Bhutan and into
Arunachal Pradesh, but later collections from that area have been
identified as P. bracteosa (or P. gracilipes)."
Since I am not able to differentiate between the two, as of now I am keeping the two same.