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Yep. In reality, pretty much all stems are 40mm high, +-4mm, so when it comes to replicating between bikes it's not really a variable that makes much difference.
I'm long legs, short torso short arms, a true dino, which means I end up needing large frame size to get the stack I need, and then a relatively short stem (100mm) to get the reach right.
Hovis
Thanks, that's a great spreadsheet, which it turns out, on trying to save, that I already had saved!
It does use 1/2 the stem stack + headset + spacers and it transpires the head tube angle makes quite a difference.
Confirms the 55cm would need at least 130mm -10/12 stem and ~8cm spacer stack (somewhat ridiculous) whereas the 58 would work nicely with a 120mm -10 stem and minimal spacer stack, time to unwatch the 55cm that is on the bay!
Long arms and legs, with a short torso, seems to necessitate for 'pro' length stems.