They are certainly not the same hull.
Royalex Courier specs: LOA 14' 7", gunwale width 32", width at 4" waterline 29", depth at center 15", bow/stern height 22", rocker "slight", average weight 59 lbs.
Explorer 15 (Royalex): LOA 14' 9", gunwale width 35 3/4", width at 4" waterline 33 3/4"...