The patterns practiced in TKD undeniably have the stamp of other arts all over them, yet the actual sequence of movements have been changed and reshuffled.
About ten years ago, probably less than that, one of my objectives was to go back and study the old Palgwae poomsae and Pyongahn hyung, as well as revisited my Shotokan forms, and join my friend's Shorin Ryu school to understand the evolution. I mentioned this to GM Park and he said there was no need, that all I needed to do was practice the Taeguek and yudanja poomsae, as well as his Kibon exercises.