Well, Nola's low point was 8.64 ERA, but that was only the first game. IIRC Phillies also went 5-0 in Walker's first five starts last year (4-1, actually. But they scored runs for him).
I don't think it was a serious one-for-one comparison, but relative to their respective seasons, they are playing sort of the same role. Obviously it's early but nearly 40% of this team's losses are in Nola starts. Walker pitched in 19% of last year's losses.
