You do not need to worry about this, although I know how scary diarrhoea can be pos- Whipple. I still have occasional trouble balancing my Creon with the food I eat, but in general I have it under control. .
For me, the following is true:
I needed much higher doses of Creon than I had thought (you cannot overdose, and it turned out I needed more than double the original guestimate by my surgeon).
Creamy and fatty foods in general require more Creon.
Even a tiny snack, e.g. an apples, requires Creon.
You may find it useful to have both 10,000 and 25,000 Creon available.
Things can still go out of balance, as nothing can replace the efficiency of the pancreas.
But, if your tumour count is down you are OK - this is just a mechanical hitch.
Good luck and warmest wishes....