If both are males they will soon start to fight if placed together (by the time they are 9-12 months old or when they begin to reach sexual maturity). If one is male and one is female they should get along but would very soon need to be separated so that they do not breed too early (you definitely do not want a female that is too young or too small to become gravid as it could result in calcium/nutritional crashes and/or egg binding). If both are females then they should be able to go together and stay together indefinitely.
Also, both should be very close in size before being placed together so that the larger gecko does not dominate the smaller one.
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