We sometimes treat ourselves to an Indian takeaway and OH always gives me his chilis from his dishes. He likes dishes with a bit of heat, but does not want to "risk" biting into the actual chilis.
Now these are always the same chilis of the same type that the restaurant uses and they always look the same. But some are barely hot, others are really potent. For many reasons, the same peppers on the same plant or the same type can be more or less hot.
I love cooking with my home grown chilis too. OH has "limited" me to half a chili per dish. Which sometimes is quite hot and at other times barely "warm". There are big differences.