Radio Shack Bicycling

Will a BR-P2 lithium battery work in place of a CR-P2 lithium battery?
Radio Shack does not carry CR-P2 lithium batteries which is what I need, so I was wondering if a BR-P2 lithium battery will work. Both are 6V. It is for a Shimano Auto-D bicycle gear shifter.
Both are 6v lithium batteries and the dimensions/shape are identical. The BR is Panasonic, and the CR is GE/Sanyo.
Lance Armstrong’s Team Radio Shack Trek Speed Concept TT Bike