L'avis de Air Transat Airbus A330 300 346pax de Lewis Weston (#26720)

Travelled back from Toronto on C-GTSD; seating in rear economy cabin is unlike rows 4-30. Legroom is compromised by thickness of seat backs. I believe this a/c is recently acquired from a premium carrier. Were these 'extra' seat trasplanted from a retired plane? Did not resemble usual Airbus seats. Flight out on C-GTSO had uniform seating & legroom.