No worries, you're here to learn right?
But...
subspecies have bigger differences for example Bcc's in general have different head shapes and saddles with pronounced peaks, etc... you'll get the differences eventually
some examples of the less common subspecies...
Boa constrictor sabogae
Boa constrictor occidentalis
Boa constrictor longicauda

there are not all of them, they're just some examples, and there are also some subspecies that are not completely recognized.