I got a couple of pics to show u the difference;
On the picture below you will see the common windows-peaks witch are usually seen on the BCC subspecie, but still here are some without the windows-peaks;
As second we have the red tail of a BCC, i never saw a TRUE redtail without the red in the tail;
Also watch carefully at the side pattern, this is also different from the BCI group, the samples above are from the suriname locality...
My advise;
Just watch loads and loads of pictures, only after a while you really start to recognise them...
PS;
Something i allready wanted to say at this forum;
Why is the redtailed boa subforum in use for imperator boas and morphs as well.... A redtailed boa in my eyes is a BCC no exception...