http://www.fangraphs.com/leaders.aspx?pos=np&stats=bat&lg=all&qual=0&type=1&season=2015&month=24&season1=2015&ind=0&team=0,ss&rost=0&age=0&filter=&players=0
Low leverage=100 wRC+
Medium leverge = 101 wRC+
High Leverage = 93 wRC+ (better reliever in)
Base empty = 96 wRC+ (better pitcher, thats why bases are empty)
Men on = 105 wRC+ (worse pitcher, hence men on base)
Men in scoring = 102 wRC+ (worse pitcher, but sometimes reliever brought in)
When adjusting for quality of competition, I'm sure it is all the same.