How to distinguish the first generation from the second generation by Canon Koutenglong lens 18-200? Better spend money on photos.

Generation 1: af18-200mm f/3.5-6.3xr diiild aspheric surface [if] macro model a 14.

Lens composition: 13 group 15 lens, closest photographic distance: 0.45m, maximum photographic magnification: 1: 3.7 (f = 200 mm, closest photographic distance: 0.45m), total length: 83.7mm (maximum elongation [200 mm

62mm, number of diaphragm blades: 7, minimum diaphragm: F/22, weight: 405g.

Second generation: 18-200mm f/3.5-6.3dii VC model b0 18.

Lens composition: 14 group 16 lens, closest photographic distance: 0.49~0.77m, maximum photographic magnification:1.4 (when f = 200mm, closest focusing distance is 0.5m), length: 96.6mm, and maximum diameter: 75mm

62mm, number of diaphragm blades: 7, minimum diaphragm: F/22-40, weight: 400g g.