You first need to know what kind of shocks you have. Most do not realize that not all shocks are created equal. The oil level should be the same in both but how much depends on the type of valve used what travel they are set up for. Without knowing what brand they are or what they were made for there is no way to tell how much oil their should be but my guess is you would match the lower oil level shock with the other. The shock low on oil lost the oil somewhere due to a leaky seal. Where do you get seals for the shock. You also mentioned they were gas shocks so another question is how many PSI of nitrogen goes into the shock. Gas charged shocks use both oil and nitrogen, they work together in their separate chambers which work with each other. So even if you can find a seal and correct viscosity of oil for those shocks you will also need the nitrogen as well as the manifold gauges to safely and properly charge them. Just to give you an example when Blade Powersports went to Works for a custom shock they required the basic information to produce a shock for the buggy. Weight of complete buggy empty, weight of each corner of buggy and total travel of suspension just prior to bind. With this information they can then determine the piston size, rod size, valving, viscosity of oil, PSI of nitrogen, spring rate and type. Looking at the shock pics one is red and one is blue which tells me they are both rated differently. This can be the reason one is lower on oil than the other. If those are of a common shock builder such as Works or FOX it should be somewhere on the shock. If identified than the best bet would be to send them to the manufacturer to be rebuilt.
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