I learned this trick from an old buddy of mine. For those that regularly go back and forth over the NJ/NY border, attached is a chart that takes the conservative minimums on size, limit, and season period. Following these guidelines will ensure you are within the legal limits on both sides at all times. I added far more species than I generally target hoping to help some of you as well.
For example, the NY Fluke guideline is 2 fish at a minimum of 21" each from May 15th-Sep 6th. NJ is 6 fish at a minimum of 18" from May 29th-Sep 6th. If you combine the absolute minimum you would need to always have no more than 2 total at 21" minimum (NY's regs) within the dates of May 29th-Sep 6th (NJ's regs).
Obviously if you are solely staying on one side of the border, follow that state's guidelines.
NJ regulationsNY regulations***Disclaimer******
Please double check my work first!