I don't even think WTP did this style right. Seams and Stitches is the only release of theirs I've liked, and I think that's because it sounds far more influenced by The Wonder Years than old Four Year Strong.
I really like Seams and Stitches. The older stuff, whilst not great, is enjoyable and great for sing-a-longs. They really worked hard on the lyrical side of things which you can see in Cags or Postcards.
The whole "easycore" thing is pretty much based around FYS so it's a given they will sound similar for a bit. It takes a while to get settled from what I've seen.