There will be no damage from running a 100, 120 OR 140 mbar cap. The only reason MB does not produce the 100 or 120 any more is because later models use the 140. Since they can be exchanged, it's cheaper to produce 1 common item instead of 3.

Running the cooling system at 20.3psi instead of 14.5psi will also help it stay cooler for longer by raising the fluids boiling point.