Its not a good idea to rely on the compression figure, it can vary depending on the gauge, battery, starter( crank speed) and the way its done ( cold, hot, WOT). To your surprise it could even be highet on a healthy old angine because of carbon built up. The factory pressure is 12.2 kg/cm2 for a turbo RB25.
A leakdown test will be more accurate indication of the condition of the engine .