Correct. Do NOT use "tube above triple" to compare fork lengths. It's acceptable to use this measure when removing your forks on a bike for service to get them back to the correct setting, but unless both bikes (and both fork builds!) are identical, it won't yield a useful measure.
For example: when I had my AK-GAS cartridges installed, we extended the stock tube length 5mm. So, even comparing two sets of 1125 forks, mine are going to yield a different ride height when measured "cap above top triple" only.