Shedding
Their coats shed differently: the Pembroke Welsh Corgi moults most as the seasons change, the Pyrenean Shepherd sheds through the year.
Temperament
They differ most on sensitivity (Pembroke Welsh Corgi: hardy, takes a busy home in its stride; Pyrenean Shepherd: needs a calm, predictable home) and on independence (Pembroke Welsh Corgi: keen to work with you; Pyrenean Shepherd: cooperative, with its own ideas).
Alike
They are much the same size as adults, about 11 kg (23 lb) for the Pembroke Welsh Corgi and 10 kg (22 lb) for the Pyrenean Shepherd.
Alike
Both are rated the same on loyalty: sticks close to its people.