No. The DirecTV data for the 119 is going to have the 22-32 transponders in it and the DISH data will have 01-21 in it. So a DISH LNB probably isn't likely going to be passing any transponder frequencies above 21 and so you won't show a lock on a meter trying to tune the higher transponders. I think there are some DirecTV D-Tube LNBs out there and that could go in to the 119 slot on the 500 just for pointing purposes. Give it a try though, I could be wrong and DISH is passing those higher transponders through their LNB, seems worthless for them to do it though.
If I recall, you can buy a shielded USB cable to download a new set of satellites. Unshielded USBs don't work if I remember correctly.