Here's the original Dragon #214 version from Johnathan M. Richards "The Ecology of the Owlbear. The greater claw damage is the only real mechanical difference. Note there's a price listed for their young and eggs.
Winged Owlbear
CLIMATE/TERRAIN: Any nonarctic
FREQUENCY: Very rare
ORGANIZATION: Family
ACTIVITY CYCLE: Late afternoon/early evening
DIET: Carnivore
INTELLIGENCE: Low (5-7)
TREASURE: Incidental
ALIGNMENT: Neutral
NO. APPEARING: 1 (2-5)
ARMOR CLASS: 5
MOVEMENT: 12, Fl 18 (E)
HIT DICE: 5 + 2
THAC0: 15
NO. OF ATTACKS: 3
DAMAGE/ATTACK: 1-6/1-6/2-12
SPECIAL ATTACKS: Hug, surprise
SPECIAL DEFENSES: Nil
MAGIC RESISTANCE: Nil
SIZE: L (8’ tall, 20’ wingspan)
MORALE: Steady (11-12) + Special
XP VALUE: 975
The winged owlbear is the ultimate synthesis of owl and bear. It looks like a standard owlbear, but in addition it has a pair of large wings growing from its shoulders. They are just as nasty-tempered as their ground-dwelling cousins, and speak the same language of screeches.
Combat: Winged owlbears fight as the wingless variety, utilizing their front claws, sharp beaks, and mighty hug. In addition, they are almost totally silent in flight due to the construction of their wing feathers, and this imposes a -6 penalty on opponents’ surprise rolls.
Habitat/Society: Winged owlbears can be found in almost any nonarctic environment (when they can be found at all—they are very scarce), but seem to prefer wooded forests and mountainous terrains. Due to their flight capabilities, winged owlbears tend to claim larger territories as “theirs”—usually ten to twenty square miles.
Winged owlbears live in mated pairs. If encountered in their lairs, there is a 25% chance there will be 1-3 eggs (20%) or young (80%) in addition to the adults. The young are identical to normal owlbear young, as their wings will not support them in flight until they are at full size.
Ecology: Winged owlbears tend to live slightly longer than the normal variety, often reaching 25 years or so. They are sought after by wizards, even though to date no one has managed to domesticate one; nonetheless, eggs can go as high as 4,000 silver pieces, while the price for live young can reach 10,000 silver pieces.