According to consultation with our supplier, the cable should be compatible with the Sony Walkman NW-A45.

According to my research, the connection cable only fits the following units: NWZ-X1050 NWZ-S545 NWZ-S544 NWZ-E443 NWZ-E444K

Yes

As far as I know, Sony exclusively uses the WM port (unfortunately). But check quickly, the connector is 13mm wide and looks like a small HDMI (two angled corners).