CPU, GPU, Video Playback, Connectivity, USB, Power Supply, Dimensions and Weight all exactly the same.
Memory, the original also shipped w/2GB of RAM.
Storage, the original also shipped w/16GB of RAM.
Video & Audio Output almost reads exactly the same except for the original only w/HDMI 2.0a and the Mini-A shipped with HDMI 2.1
Like you say it uses the same dtb file, so it’s very strange.