Ren with Sea Sled was supposed to be one of the 10 unproduced figures for the 2nd Series of PODW. I myself do not remember Ren without a shirt and with a sea sled but Hasbro kept very faithful to the series.
The toy itself has a few details missing. The Ren shown in the Hasbro catalog has more spikier arm armor and knee covering on his boots. My only hypothesis is Hasbro wanted these figures out and made adjustments to keep costs down, which still failed to have this 2nd assortment released.