Hardolph,
Yes, two different polyline feature classes. The problem with selecting common vertices is that whoever, or whatever, drew the lines really went out of their way to draw them as stupid as they could. So, there are MANY vertices that aren't needed. Like, instead of drawing one straight line, they wen't up and down the line 2 or 3 times placing random anchors. So, it's just easier to reshape each line out of each feature class. I was hoping for a way to reshape and get the line where I want it on one feature class, then just have the other "follow" the edit that was just done.
I'll give the other way a shot. I'm an idiot, so I'm not completely sure I can accomplish what you said.