There are few differences between the Tandy Color Computer and the DragonData. The keyboard is wired a little differently, the ROM has been adjusted, and the memory addressing is slightly different (easy to fix). Both machines can often load the same software.
The DragonData is therefore also based on the Motorola 6809E and the Motorola 6847 VDG.
A year after the Dragon 32, the Dragon 64 was released. Except for a difference in case (white versus light gray), extra memory (32K or 64K in the Dragon64) and a serial port on the Dragon64, the machines are the same.