difference between cst sales 14.5 and central sales tax 14.5

Hi experts i want to know the diffenrence between difference between cst sales 14.5% and central sales tax 14.5%.

when i surf the net i got the answer as

CST SALES 14.5% MEANS   CENTRAL SALES TAX SALE BEFORE SALES TAX.
CENTRAL SALES TAX 14.5% MEANS  TAX ON   CENTRAL SALES

 Iam from Andhra Pradesh

but unable to follow the difference please explain me

thank u