Ive looked at those (the ones I could find) this is completely different.
On the board in question notice the difference on the LHS of the Z80 - it is not the standard galax boot as in the bottom picture, that has an edge connect from the Z80 for test purposes.
The original Balley-Midway single Galaxian boards also have this.
Then again it may just be a different version boot, but why the Taito sticker which appears to be original.