I came here from google looking for an answer to the same question.
I don't have a minitaire conversion chart. But you can get a VGC & VMC --> Citadel chart with a google search.
As for Minitaire...does this help?
https://docs.google.com/file/d/0B5g16alesVhZVEZWOWhlMW42RWM/edit
EDIT : Scratch that. The colors on that doc look to me to be WAY off.