Differences 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
To the best of my knowledge SOME boas have heat pits and some pythons do not.  Pythons have 6 rows of teeth (I know because I've been bit by a lot of pythons).  I can't recall on boas.  ETB's do have the pits.  I believe womas and black headed pythons are a couple of example of pythons which don't.  

One of the things that may be causing you so much frustration in your searching is that the field of classification or taxonomy is ALWAYS changing.  Reptiles have only really gotten a lot of attention in the past 10-20 years, so scientists working in this field are still really sorting out which snakes are really related!  DNA testing is helping, but with the world economy the way it is there is not a lot of money available to figure out which snake is which so to speak.