I've run some checks, this is how it pans out...
1.BIN =~ GFX1
2.BIN =~ CPU @0000
3.BIN =~ CPU @2000
4.BIN =~ CPU @4000
5.BIN =~ GFX2 @0000
6.BIN = GFX2 @2000
When compared to other Exerion sets, we are missing GFX3, SUBCPU, and 5 proms. Also the 2nd Z80 is missing off the board.
This, I think, means that there will be no background graphics. Also, the soundlatch will work in a different way.
Your screenshot shows stars. Exerion doesn't have stars.
This isn't a simple drop-in bootleg, it requires further work...