In the subject part numbers, replace the ( ) with the applicable number of circuits.
The difference is protrusions on the sides of the housings to make handling them easier. The SHR-( )V-S is without the protrusions and SHR-( )V-S-B is with the protrusions. Please see the image below for more details.
The complete data sheet can be down-loaded from the JST web site at the following URL:
http://www.jst-mfg.com/product/pdf/eng/eSH.pdf