The new app covers both 218 and ID41 and 210 in one app, ie both the Ethernet and Bluetooth protocols in a single app. Also the volume control design language is enhanced in that one can touch and rotate the on-screen volume control in a much more intuitive manner.

I would suspect that the older app may be depreciated as this new one takes over, just a guess.

808v6, M60, MC200, HD621, Lumagen XE, 504, SB Touch, 563, 201, 204, 208, MPMAX 221, M80, Explorer, Explorer2.