What Roger and Bree said in 612 is that they were thinking of “home”. We can’t assume we know when or where that is, other than they remained in that time and near the Ridge. When Claire returned from 1968-69, she knew when and where Jaime was, and that is where she ended up. When Bree travelled back, she knew when Claire was, but not where, so she went back to the time, but in Scotland but found Lallybroch. Roger, in following Bree, essentially followed Bree back in time even though he didn’t know exactly where Bree was.