Do different people have the same number of mitochondria in comparable cell types?
".... The number and shape of mitochondria vary dramatically in different cell
types and can change in the same cell type under different physiological conditions, ranging from multiple spherical or cylindrically shaped organelles to a single organelle with a branched structure (a reticulum). The arrangement is controlled by the relative rates of mitochondrial division and fusion, which are regulated by dedicated GTPases that reside on mitochondrial membranes' In addition, the total organelle mass per cell can be regulated according to need.
For example, a large increase in mitochondria (as much as 5-10-fold) occurs
when a resting skeletal muscle is repeatedly stimulated to contract for a prolonged period."

Alberts, Bruce; Alexander Johnson; Julian Lewis; Martin Raff; Keith Roberts; Peter Walter, Molecular Biology of the Cell, 5th Edition.

As the Paragraph above explains, it can be assumed that due to different metabolism in different people, a specific number of mitochondria in the same cell types for different people may not be assumed.