What is the difference between the Hatco blower motor 02.12.003 and 02.12.003B?

[john]

Looking at the manual for the Hatco FSHC here:

http://download.partstown.com/is-bin/intershop.static/WFS/Reedy-PartsTown-Site/-/en_US/manuals/HT-FSHC_pm.pdf 

 

 

120V units manufactured on or before June 1988 should use Hatco 02.12.003B.00 BASIC BLOWER MOTOR KIT 120VOLT | Parts Town 

 

While units manufactured after should use Hatco R02.12.003.00 KIT,BLOWER MOTOR-FS&FSHC-120V | Parts Town 

 

As far as more technical differences, I cannot say.