Equivalent of dried (ground) pepper when the recipe calls for crushed
Here's what I've been able to find (looking at crushed red pepper flake substitutions):
This site says to 2/3s as much ground as crushed:

Substitute 1⁄2 tsp (2 mL) ground cayenne pepper with:
• 3⁄4 tsp (4 mL) crushed red pepper flakes

I'm not sure why the mL are doubled but the tsp are 2/3s
This site says 2/3s as well:

1/2 tsp Cayenne powder per 3/4 teaspoon red pepper flakes

So, in your example from your other question, you would use 4-1/2 tsp of the chili powder mixture (6.75 tsp x .666).