I will say this regarding the UTH tours:
Historically, the guides are given a little leeway on what they want to showcase, and base it slightly based on the members and size of the group that they have.
Case in point, during our tour in 2016, we had a smaller group that consisted of several of us that were well versed in HHN already (already done the tour a few times). Almost no tours went through Tomb of the Ancients. Mostly due to the limited space in there, but also because groups were usually more interested in seeing IP houses.
I was shocked when our guide took us over to that tent, and let him know how surprised I was. He basically said what I already stated. That they're given suggested houses, but determined that we were a small enough group to go throw Tomb, and most of us would get a kick out of seeing an original house.
TLDR: Most tours will feature a similar mix of houses, but can very depending on the guide's whim. If you're interested in seeing a certain house, I would mention it when your group first convenes.