here some info i found
There are many subspecies with several locals that produce various size, color and pattern variations that for most it is impossible to tell the difference.This is complicated by things like B. C. Constrictor and B. C. Imperator both occur in Colombia , other subspecies overlapping in geographic areas, and cross breeding in captivity and possible natural intergrades.
Generally BCC have peaks in the saddles and brighter red/ maroon tail color, BCI usually have orangish to brick red tail color. Bcc are usually larger than the other subspecies though columbian BCIs also large reaching 10ft. But, saddle shapes and tail color is not a definitive way to tell, scale counts are if its not a subspecies mix. Over lap in the counts also make it more confusing: there are a few examples.
BCC
scale counts - 75 to 95 dorsal rows.
227 to 250 ventrals.
49 to 62 subcaudals.
BCI
scale counts - 56 to 79 dorsal rows.
225 to 253 ventrals.
47 to 65 subcaudals.
BCA ( Amarali Boa)
scale counts - 71 to 79 dorsal rows.
226 to 237 ventrals.
43 to 52 subcaudals.
BCL (Longicauada)
scale counts - 60 to 76 dorsal rows.
243 to 247 ventrals.
50 to 67 subcaudals.
BCO (Occidentalis)
scale counts - 65 to 87 dorsal rows.
242 to 251 ventrals.
45 subcaudals.