Again, i'm sure Boyce has taken the difference in height into consideration, HB, and it makes no difference if its solid fuel, oil or gas! Boyce is only interested in the temperature.
Sure, that’s your hope, Snow, not something that’s been shown though. A three-inch height difference and a different Aga model aren’t trivial, and if temperature is all that mattered, it wasn’t a reconstruction at all he’s just doing a heat demonstration.
A three-inch change directly affects precise contact points. Alter the height and you alter where the body meets the handles , which is exactly what the enlarged photo shows that I posted.
And yes, they do differ. The ashpan assembly differs, and that can affect heat behaviour at the lower section.