Size
The Tibetan Spaniel is larger on average: about 5.5 kg (12 lb) as an adult, against 4.1 kg (9 lb) for the Pekingese.
Lifespan
In UK vet records the Tibetan Spaniel lives longer: a median of 15.2 years, against 13.3 for the Pekingese.
Grooming
The Pekingese needs more grooming, daily brushing, where the Tibetan Spaniel needs brushing a few times a week.
Temperament
They differ most on intelligence (Pekingese: easy-going, simple routines; Tibetan Spaniel: learns readily, likes games) and on handler demand (Pekingese: needs steady training; Tibetan Spaniel: suits a first-time owner).
Alike
Both are rated the same on independence: decides for itself.