Well, its a little more complicated than just a y/n answer. It depends on the valve timing hardware, as well as if you mean the actual "dynamic combustion pressure" or simply the mechanical static ratio of the piston stroke calculated with TDC and BDC volume.
Some engines utilize multiple camshafts with more than 2 valves, dynamically adjustable gear or belt drives that can affect cam timing, or lifters (aka "rhoads" or crane "hi-vac" style), and some other specific-engine designs, which vary the valve duration, overlap, and lift RPM dependent. For example, the rhoads type lifters "bleed off" some oil pressure at lower engine speeds, reslting in less overlap and/or duraton, effectively raising an engines low rpm dynamic combustion pressure. So although the static "compression ratio" is constant, there are other confounding variables that affect the engines effective dynamic pressures. Even the intake runners*( and to lesser degree, the exhaust) design can affect dynamic compression pressures, as at certain speeds, a particular tract will be more efficient at filling the cylinder with greater volume of fuel/air (increased volumetric efficiency due to harmonics of length/speed/cross section/surface texture and even type/radius of bends , valve/seat angles) and cause a higher combustion pressure AT THAT SPEED.
That increased "scavenging" effect is also apparent with certain header and exhaust designs, that also cause more spent fuel charge to be removed from engine resulting in relatively lower cylinder pressure (partial vacuum actually) again increaing the amount of new fuel/air mixture drawn into engine, again obviously affecting that cylinders maximum combustion pressure, again at that particular engine speed where the exhaust runner/collector/merger are tuned to take advantage of the flow characteristics.
There are other ways effective cylinder pressures are also affected, ie stoichiometric fuel/air ratio adjustments (FI "fuel curve"), spark timing curve, temperature, rpm, load, but these are more "givens" in the equation than variables.
OK, so I took the long way home, but you asked..!