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You can process multiple files at the same time.
This is called batch processing.
You can use the Auto Color Method with Photoshop Elements.
Go to Batch Processing - Auto Color.
If you're using one of the adjustment layer methods (Channels Method and Hue/Saturation Adjustment Layer Method), you can drag the adjustment layer into the palette bin of the other photographs.
The layer will make the same changes on the other photographs.