See images here and leaflets from British association of dermatology.
Zoons showing the reflection of the falsh as the surface has a glassy appearence typical of Zoons. note the ‘island’ of normal skin between the ‘kissing’ lesions.
Behcets for comparison
even more obvious ‘island’ of normal skin between lesions
some times the lesion on the shaft is ‘beefy’ rather than the glassy type on the glans