Terra Force, an arcade game featuring additional Z80 hardware in its Japanese release, stands out for its variations. Set 1 includes this Z80 enhancement but may have imperfect graphics. Set 2 shares the imperfect graphics but might differ in other aspects of programming. These variations hint at potential differences in gameplay, level design, or even the overall visual presentation of the game. Identifying the developer or distributor would shed further light on its history. 

Terra Force (Japan version set 1, with additional Z80)

Terra Cresta (YM3526 set 2)