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So for some backstory if it helps I bought a 2013 MacBook Pro retina with no ssd and no WiFi card for 300, it also needs a few other parts but I was wondering if I can use the WiFi card from a 2015
Yes the MacBook Pro Retina (2015) Airport/Bluetooth Board can be used in your system. The only difference between your MacBook Pro 13" and 15" Retina (Late 2013-Mid 2014) Airport/Bluetooth Board is the WiFi standards supported: 802.11n Vs 802.11ac.