polyCompare2.py

def check_faces_in_the_same_place(sel=False):
    objs = ls(sl=sel, type='mesh')
    errors = []

    for obj in objs:
        areas = {}
        for f in obj.f:
            a = round(f.getArea(),5)
            if a in areas:
                areas[a].append(f)
            else:
                areas[a] = [f]
    
        faces = []
        for a, ff in areas.items():
            if len(ff) > 1:
                faces += ff
    
        while faces:
            f1 = faces.pop(0)
            s1 = sorted([[round(z, 4) for z in p] for p in f1.getPoints()], key=lambda x:x[0])
            for f2 in faces:
                s2 = sorted([[round(z, 4) for z in p] for p in f2.getPoints()], key=lambda x:x[0])
                if s1 == s2:
                    errors.append(f2)

    return errors