Dumeril's ground boa question

[Vypyrz]

Just for confirmation from what i can tell from the picture, the Dumerils is brighter with more defined markings, and the Madagascar is darker with a stripe-ish marking down the center of the back?

Not necessarily. The coloration can vary in both snakes. I look at the side markings. On a Dumerils (Acrantophis Dumerili) the black side markings are more of a " + " shape, and will usually go higher up, or join, across the back. The Madagascar Ground Boa (Acrantophis Madagascariensis), the black side markings are more " - " shape, and do not go up across the back.

Dumerils:




Maddy:




Also, note the big difference in head shape:

Dumerils

MGB: