j frame holster question

[WDE91]

I own a 642 J frame it has a 1.875" barrel

http://www.smith-wesson.com/webapp/wcs/stores/servlet/Product4_750001_750051_764961_-1_757768_757767_757751_ProductDisplayErrorView_Y

The Nemesis says it is for a 2.25" barreled guns

http://www.midwayusa.com/product/485234/desantis-nemesis-pocket-holster-ambidextrous-s-and-w-j-frame-2-1-4-barrel-nylon-black

Will those work?