Here is part of an N_Gauge railway stack, CombineZ's Detail functions work better if all frames in a stack are taken with constant illumination, failing that you can use the Balance Colour and Brightness (Local) function which lives on the Stack menu. Make the Frame you would like the others to look like into the Active Frame by making it visible on the screen before invoking the function. For this example I made the third Frame active. Here is the first Frame after the operation.
The other two looked vertually identical.