[Elecraft] IF Shift vs. Passband Tuning?

[Jeff]

Hi gang,

Are IF shift and passband tuning (PBT) the same thing?  I assume that they produce the same effect.  I have a Ten-Tec Argonaut V that has PBT, but I have never used that feature, thus I don't miss it on my K2.  I guess I just don't grasp what PBT would do for me that I can't do with RIT and the variable width DSP filter of the Argonaut V.  However, I'm a CW op; someone commented that IF shift is more useful on SSB than on CW.  Why is that?

Thanks, 73 & 72,
Jeff
WB5GWB
Long Island, NY