The circuits are not the same. The GPCB MKC adds a 100K resistor at R26 which changes the max gain of that stage to about 5. (1+ 470K ((R10))/ 100K ((R26))+15K((R9))=5.1.
Obviously, if you wish to increase the gain of that stage, you may reduce or jumper R26.
The circuit should still exceed unity output level with the stated values. If it does not, then there be a different issue.