They are both listed as retail. Heres what Newegg has listed for both:
BP version
64 bit Support: Yes
Cooling Device: Heatsink and Fan
Hyper-Transport Support: Yes
L1 Cache: 64KB+64KB
L2 Cache: 512KB
Multimedia Instruction: MMX, SSE, SSE2, SSE3, 3DNOW! Professional
Operating Frequency: 2.0GHz
Process Type: 90 nm
Series: Athlon 64
Voltage: 1.35/1.4V
Model #: ADA3200BPBOX
Item #: N82E16819103535
CG Version
64 bit Support: Yes
Cooling Device: Heatsink and Fan
Hyper-Transport Support: Yes
L1 Cache: 64KB+64KB
L2 Cache: 512KB
Multimedia Instruction: MMX, SSE, SSE2, SSE3, 3DNOW! Professional
Operating Frequency: 2.0GHz
Process Type: 90 nm
Series: Athlon 64
Voltage: 1.35V
Model #: ADA3200CGBOX
Item #: N82E16819103602
In looking I only see a difference with the voltage. The CG is $15.00 more.