Big brands know this, and manipulate mAh ratings.
It depends on the draw, and other things, hence they say "better for this/that in hi/lo drain devices".
Less draw is more mAH. More draw is less mAH.
Temperatures are important.
The Pueket effect.
Etc.
But you probably already knew that because you spelled mAh correctly.
I test at a very low draw, measured in days and weeks instead of hours, and these are compatible to the more expensive versions, within reason and more.