Not sure if you are asking a question between these battery types or providing the answer ... so, just in case it's the former:
Quoted from master-instruments.com.au:
"Because of the MnO2 content in the cell, CR type batteries have a tapered discharge profile and perform well in comparatively large current applications. Characteristically, CR type batteries begin with a slightly higher voltage than BR during discharge. However, as a CR cell discharges, the operating voltage drops over time because of the rise in internal impedance. CR type batteries are slightly less robust than the BR type when exposed to temperatures at the high end of the operating temperature range and can experience a rapid increase is self-discharge at the high end of its temperature rating.
BR series batteries exhibit stable voltage over the entire life of the cell and stable performance at comparatively high environmental temperatures. The self-discharge of the BR chemistry at elevated temperatures is also superior to other lithium coin cell batteries."
... and if you were providing an answer, the quote pretty much agrees with your assessment.
