They're totally 2 different letters and they're pronounced differently as well. ق is pronounced as /qaf/, check pronunciation at 3:34 http://www.youtube.com/watch?v=su1IP07F3lc غ is /ghain/, also check pronunciation at 0:25 http://www.youtube.com/watch?v=4OTpbfyXSqw

me refiero a la pronunciación

؟هل تعني من حيث المخرج و نطق الحرف