Yes, that is generally possible if it is a USB-C charging cable. The charger has a USB-C port and is compatible with USB-C cables; Fairphone also recommends USB-C cables for its devices and states that third-party chargers are possible, provided they are compatible. If your Fairphone cable is a USB-A to USB-C cable, it can charge via the USB-A port. For optimal fast charging, a USB-C to USB-C cable is the more suitable choice.