I have tried smaller decals but they are fiddly and expensive to produce clearly in such a small size. They are accurate but not necessary, as sashimono or other field signs would do the job. Though I do put them on some troops. You could put them on both or either it depends how uniform you want to make them. Personally I think when doing complex things in such a small scale, if you cannot do it perfectly don't bother as it will detract from the appearance of your collection.