I don't know how difficult it is to claim copyright infringement on a pattern -- probably it is not considered worth the trouble or cost to sue if there are actual differences between the patterns. As for using the same name, maybe A Quilting Life is trying to draft off the popularity of the other pattern, hoping people will buy it by mistake. I don't think the names of patterns are protected; when I look up a pattern name, it is not unusual for several different patterns of the same name to come up.