No, the Cable Techniques CT-PXFT-18 XLR-3F to TA3F Cable for Sound Devices is not compatible for use with the Sound Devices XL-AES 8-Channel AES3 Input Expander. The XL-AES has four TA3F inputs, so you will need a cable that has TA3M connectors. To connect to the TA3 inputs on the XL-AES, you can use the single Cable Techniques XLR 3-Pin Female to TA3 Male Cable - 20" (B&H # CACTFXMT320), which is also available in a 2-pack (B&H # CACTF3MT3220), or the single Kondor Blue Mini-XLR Male to XLR Female Audio Cable - 16" (B&H # KOMXLR16BK), which is also available in a 2-pack (B&H # KOBMXLRMF16B).

Yes it will work with SD 302 and 744T. The 744T has two Ta3/mini XLR inputs. And it's just one cable.

The cable doesn't care what device you are using, but the cable you are asking about is a TA3F to XLR female. The Zoom F8 outputs are on TA3 connectors but I would guess you want a TA3F to XLR male cable to connect the Zoom's outputs to another device, like an amp or video camera whose inputs would be XLR female sockets, following standard audio protocol.

Don't know, but you might ask Sound Devices if it will work. Good luck