Most birds have about 80 Chromosomes give or take(72-82) depending on how many they detect(many of those chromosomes are very small and go undetected), that is why you see many interspecific hybrids like Chicken-Pea Fowl, Chicken-Guinea fowl and Chicken-Quail Hybrids since they have very good...
The difference is due to the difficulty in identifying and measuring the smaller macrochromosomes rather than to any intrinsic difference among Pheasant subspecies