I think they’re very similar. The primary question is ‘how do you operationally define {”have a headache”‘|”make a sound”}’? The only conundrum is by changing definitions midway through.
Your second example of what it COULD be about is downstream of what it is actually about, but is ALSO the same (if you define “headache” analogously to “sound”), about the limits of induction and measurement.
Your third is still about definitions, including the definition of identity.
I think they’re very similar. The primary question is ‘how do you operationally define {”have a headache”‘|”make a sound”}’? The only conundrum is by changing definitions midway through.
Your second example of what it COULD be about is downstream of what it is actually about, but is ALSO the same (if you define “headache” analogously to “sound”), about the limits of induction and measurement.
Your third is still about definitions, including the definition of identity.