It is. The only difference is DCP 2K is a few pixels wider than FHD. (2048x1080 vs 1920x1080). Resolution is defined by it's height. (480p, 560p, 720p, 1080p, 2160p, 4320p... etc) not it's width. The width is referred to as the aspect ratio.
2K is referred to for cinema use and FHD for consumer use.
True cinema 2K, 4K and 8K will never be used in the consumer space. Don't confuse the two.