The details vary, but it's all similar stuff in E minor with accented notes going "bigger leap down, smaller leap up" and E pedal notes in between. Also in SotV the accent pattern is indentical as in WY. Saying that they don't have anything to do with each other is a bigger stretch than saying they are very similar.but neither have anything to do with "Wasted Years" or "Shadows of the Valley".
The Clansman bit is much more like Wasted Years than SOTV. All the riffs are based around the same simple scale, Clansman has the notes in the exact same sequence, SOTV mixes it up after the fourth note in the sequence. Also the length of the phrase is half as long in SOTV.Where?
That bit in "Clansman" is not nearly as similiar as people try to make it out to be.