Problems with ID

Adrian Drummond-Hill photographed these Bulbuls in Eastern Provice SA recently - The one on the left is our usual White-cheeked Pycnonotus leucogenys however the one on the right appears to be a Hybrid a cross with either a Red-vented or other species of escaped Bulbul any thoughts or comments welcome

Pycnonotus leucogenys
Subspecies and Distribution.
P. l. mesopotamiae Iraq, Arabia, and southern Iran.
P. l. leucotis lowlands of Pakistan and northern India, S-E Iran and S Afghanistan.
P. l. leucogenys from E Afghanistan along Himalayas to Assam.

How we are used to seeing out White-cheeked Bulbul Pycnonotus leucogenys

To see more White-cheeked Bulbul pics click HERE