To be honest, I haven't stuck a probe into the pile to see if there is a difference in temps according to egg position. From what I've seen with this and past clutches, when the female coils around the eggs, they're usually gripped by mom and held slightly above the floor so they're not always in direct contact with the substrate and belly heat. I wouldn't think there would be much difference because of that but now I'm curious and may have to find a spare thermometer probe and see.
This particular female is not as lax with my curiosities as my other girls have been or I would have gotten some candling pics up by now. lol I'm taking things slow with her so she isn't hissing and threatening to strike every time I open her tub. I will get some candling shots up in the near future and see about getting a probe in there to test temperatures at the top and bottom of the pile while the mom is brooding as well.