This is how I would order the etudes:
[easiest to hardest:]
Chopin
op. 10: 6,3,5,7,9,10,11,4,1,12,4,2
op. 25 7,9,1,2,3,5,12,4,8,10,11,6
Liszt
Etude en 12 exercises
Grande Etudes de Paganini: 5,2,4,1,3,6
Etudes d'execution trancendente apres Paganini - 5,2,3,1,6,4i,4ii
Transcendental etudes: 3,1,7,4,9,10,11,2,6,8,12,5
12 Grande Etudes: 1,3,4,9,10,7,6,2,11,12,8,5
I'm sorry I can't give you one big list because there are just too many here. Maybe someone else can.