The complete list of compatible pears is fairly large according to this link http://lists.ibiblio.org/pipermail/nafex/attachments/20120114/48efdf88/attachment.pdf .
Compatible with quince
Abbe Fetel (Abate Fetel)
Alexandrine Douillard
Ananas de Courtrais
Aurora
Bartlett (Williams)
(French and Swiss compatible only)
Bloodgood
Beirschmitt
Belle Guerandaise
Beth
Beurre Alexandre Lucas
Beurre Anjou
Beurre Capiaumont
Beurre d’Amalis
Beurre Diel
Beurre Dubuisson
Beurre Gifford
Beurre Hardy
Beurre Superfin
Butira Precoce Morettini
California
Clara Frijs
Colette
Concorde
Conference
Dabney
Dawn
Devoe
Doyenne du Comice
Doyenne Gris
Dr. Desportes
Duchesse Bronzee
Duchess d’Angouleme
Durondeau
Early Seckel
Easter Beurre (Doyenne d’Hiver)
Fique d’Alencon
Emile d’Heyst
Flemish Beauty
Fondante d’Automne (Seigneur)
Fondante de Moulins-Lille
General Leclerc
Glou Morceau (Beurre d’Hardenpont)
Gorham
Grand Champion
Graf von Moltke
Harrow Delight (HW603)
Harvest Queen (HW602)
Highland
Howell
Jeanne d’Arc
Josephine de Malines
Kieffer
Laxton’s Superb
Louise Bonne de Jersey
Louis Pasteur
Magness
Maxine (Stark’s Delicious)
Old Home
Olivier de Serres
Onward
Passe Crassane
Pierre Corneille
Rogue Red
Santa Claus
St. Andre
Sierra
Sirrine
Sucree de Montlucon
Thompson’s
Tyson
Urbaniste
Vicar of Winkfield (Cure)
White Doyenne
Warren
Incompatible on quince
Bartlett, including sports
Belle Lucrative
Beurre d’Arenberg
Beurre Bosc
Beurre Clairgeau
Beurre Flon
Beurre Gris d’Hiver Nouveau
Beurre Six
Bristol Cross
Cayuga
Chaplin
Clapps Favorite
Comte de Lamy
Dana Hovey
Doyenne d’Ete
Dr. Jules Guyot
Duchess de Brodeaux
El Dorado
Epine de Mas (Duc de Bordeaux)
Ewart
Forelle
Honeysweet*
Jargonelle
Laurence
Laxton’s Progress
Leaxton’s Early Market
Lemon
Madame Treyve
Marie Louise
Marguerite Marillat
Merton Pride
Michaelmas Nellis
Moonglow
Olivier de Serres
Packham’s Triumph
*Honeysweet so far has been compatible
for me grown as an espalier, but some
report that with free standing the union
often fails.
Passe Colmar
President Heron
Seckel
Sheldon
Roi Charles de Wurtemberg (RCW)
Waite
Winter Nellis
Worden Seckel