The motherboard slot in both PC models is M.2 2230 for a WiFi and Bluetooth combo card. So any card that fits in that slot should work as long as it supports your version of Windows and your router supports dual band WiFi (2.4 and 5 GHz). A simpler approach might be to disable both the internal WiFI and BT in Device Manager and plug in a dual-band  USB>WiFi+BT dongle.  Keep in mind that while 5 GHz WiFi may be faster than 2.4 GHz, the effective range can be shorter than 2.4 GHz, so that may affect overall performance...
I currently own two (2) Dell Inspiron PCs. One is a 3471 and the other is a 3670. Both have the same 2.4 GHz wireless card, Qualcomm DW1707 using the M.2 2230 slot for WiFi and Bluetooth combo card. I want to replace this card in both PCs with a M.2 2230 2.4 GHz / 5 GHz card such as the Intel 9560NGWGNV Wireless AC 9560. I would like to obtain the information regarding a card(s) that will be compatible with either system and that provides the dual band capability. If the Intel card I mentioned is satisfactory and will work in both PCs, please advise me. If it only will work in one of the PCs, please tell me which PC it will work in and provide the card information that will work
Dual Band Wireless Card