Can I use the activated SIM in my unlocked AT&T iPhone 7 to activate a SIM free iPhone 7?

I purchased the iPhone 7 for AT&T on apple.com at full price which is unlocked but found out that it won't support both GSM & CDMA networks so plan to purchase the SIM free model and sell the AT&T model. Unsure if I can use the activated SIM in my current iPhone 7?

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