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The reason there are two different models listed is because SAM4s has changed the insert for the SPS-500 series three times. The first insert available with any of the SPS-500 series was the 56 which had a removeable coin tray. The 56 is no longer made at all. Here is an image of the original 56 insert for comparison.
Your only choice now is the 57 or the model 60. The model 60 is the current model and probably will not be changed again. If you have one of the earlier 56 models you will need to buy a model 57 with spacers that are installed in the back of the tray (very easy to do yourself).
If you have any questions about which cash drawer insert/till you need for you machine please give us a call at 800-863-2274 and we will help you figure it out.