No there is not something out there. There are ways to verify specific changes. In GuiDBedit if you find the relevant object there is a column "last modify time'' this is an indication of a change. Also the column display current value and default value. That is the second indication.
For other changes set with fw ctl set I would recommend this sk: https://support.checkpoint.com/results/sk/sk33156
Creating a file with all the kernel parameters and their values
This will create a file with all important kernel parameters. As a reference you should get the same file from a similar default installed system (in a lab for example, same version / take)
I recommend always to keep track of custom changes like this. Check Point is a very open system, meaning you can change a lot. It is simply impossible to always be able to keep track what has been changed and what is different from factory default. Only way is solid documentation.
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