Head Texture Size vs Torso Texture Size?

EnoughButter

This may be a dumb question, but:

1) The head textures are typically 4096x4096, and the head fills most of the screen.

2) The torso textures are typically 4096x4096, and the whole body fits on the screen.

If I have a custom skin tileable texture that is scaled to the head (i.e. the skin pores are scaled to the head image), is there a formula to scale the texture to apply to the torso, so they correspond correctly, or at least somewhat closely? 

Is the head like 4x the size of the torso?

And are the arms and legs scaled to match the torso 100%?

PerttiA

Some time ago, I took measurements with G8F and 4096x4096px textures (1 inch is 25.4 millimeters / 1 millimeter is 0.0394 inches)

Torso, distance between points; 1481mm - 912.7mm = 568mm (2160px)
Torso at 4096x4096px = 0.26mm/px => 3.8px/mm

Head, distance between points; 1699 - 1576 = 123mm (1453px)
Head at 4096x4096px = 0.08mm/px => 11.8px/mm

EnoughButter

PerttiA said:

Some time ago, I took measurements with G8F and 4096x4096px textures (1 inch is 25.4 millimeters / 1 millimeter is 0.0394 inches)

Torso, distance between points; 1481mm - 912.7mm = 568mm (2160px)
Torso at 4096x4096px = 0.26mm/px => 3.8px/mm

Head, distance between points; 1699 - 1576 = 123mm (1453px)
Head at 4096x4096px = 0.08mm/px => 11.8px/mm

Thanks-so approx. 3x might get me close!