For example, a 170 lb (70 kg) person with defined muscles versus a less muscular person.
In: 166
Muscle definition comes by losing the fat under the skin. You can be strong even looking “fat”.
Also,need to define strength. If by strength you mean the ability to lift heavy weights, that comes from repetitive lifting and goes up in a steep gradient and then plateaus. That’s because muscle stretch of each individual muscle depends on the length it can shorten.
Bigger muscles will tend to be stronger in their individual task – like a guy with larger pectoral and shoulder muscles should be able to bench press a larger weight. But with practice it will improve.
If by strength you mean punching power, in an average an 85 kg “fat” guy would punch harder than 65 kg lean person. But cardio fitness plays a big role in martial sports. So a 65 kg person would be able to dodge better. Training makes the difference.
Genetic does play an important role in strength. You must have seen 3 year olds who can do pull ups effortlessly.
TLDR correlation is good but size of muscle matters.
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