2 way i can think of right now cause of lack of info and cant find anything on my phone (if you have box this is a lil easier):

1. If you go to Settings > System > Regulatory Labels if its USA / canada aka version C its gonna show you USA /CANADA LABELS. My guess is that you should have a Version C if you see those labels. (need someone with non usa version to confirm)

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1. Second Method: Go to Asus Warranty Page for USA, CANADA & CHINA and put in your serial number. If its found on USA or CANADA its a C. If not found its Global Version (A, B)

Even on Zentalk forums they dont give a clear answer.

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USA Warranty check page: https://www.asus.com/us/support/warranty-status-inquiry/

CANADA:

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CHINA: https://www.asus.com.cn/support/warranty-status-inquiry/

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You can also compare the AMAZON ASIN on whatever amazon page you bought phone from.

USA/CAN aka C: B07VZX9CRV (found on official amazon listing for Zenfone) https://www.amazon.com/ASUS-ZenFone-ZS630KL-S855-6G64G-BK-2340x1080-All-Screen/dp/B07VZX9CRV

NON USA Global aka A & B: B07SZBMB9C https://www.amazon.com.au/ASUS-ZS630KL-6-4-inches-Unlocked-International/dp/B07SZBMB9C