AI response and has been known to have hiccups so YMMV......
No, they do not have the same frequency bandwidth. On a standard 3X4 multiswitch (such as the Zinwell SAM-3402), the LNB ports and the Antenna ("Terr In" or "ANT") port are engineered to handle completely different frequency ranges. It has a much narrower bandwidth that typically ranges from 54 MHz to 860 MHz.