Whew!  Salty.  Appears they are one and the same.  My opinion only.

http://www.ebay.com/itm/Sensor-1-Replacement-Power-Module-for-John-Deere-Comp-U-Trak-100-200-300/171217100128?_trksid=p2047675.c100011.m1850&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D28808%26meid%3Ddd938d9f55a94a668f7b3c428bf1b55f%26pid%3D100011%26rk%3D2%26rkt%3D2%26sd%3D290901304951