Difference between boas and pythons

Question
Hello

My question isn't about pet boas or pythons I'm more interested in wanting to know the anatomy for the two for a research paper.  I researched online about the differences between the two I get different answers from different websites or different people.  I know that boas give live birth to live young and pythons lay eggs.  I know that they have skeletal differences especially in the head.  But the thing that confuses me are the number of teeth and heat sensing pits.
 
I know pythons have more teeth than boas but do they have more rows of teeth or just more teeth in that one row?

Also don't boas have heat sensing pits as well or no?  This question is what confuses me the most as many people over the internet claims different and argues the fact that boas don't have heat pits and some people say that they do.  Is it because some boa species have heat pits while other boa species do not?  Or are people seeing something on the boas face and are getting confused?  I'm looking at pictures of boas and I don't see any but I came across a face shot of a emerald tree boa and it looks like it has very distinct heat sensing pits or is it something else?

http://familytrees1.com/emerald-tree-boa



Thank you for your time.

Answer
They have the same number of rows of teeth, but pythons have more teeth total.

Some species of boas and pythons have visible heat-sensing pits, while others do not.  Some of that has to do with lifestyle.  Fossorial snakes would do well not to have sand-traps on their face, after all. :)  So, the sand boas don't have them, but tree boas do.

Pythons have one more bone in their skull than boas do.

As you pointed out, pythons lay eggs, whereas boas are ovoviparous, retaining the eggs in their body until they hatch, and giving birth to live young.

These features are enough for them to be classified as one or the other.