If I had to guess what these are...
AK220, an AK240 stripped down to just be a usb dac and dap, retains balanced output
AK200, an AK220 that has two channels stripped to provide single ended output only
Which I'll be honest... is awesome for anyone who doesn't care about the AK240 feature set. It also gives them a product to compete directly with the Calyx M. And in AK tradition... it's odd looking :P