Hi Steve,
I cannot offer any suggestions as to a canned food to recommend for diabetes/pancreatitis but can say that the two brands you mentioned are a lot higher in fat than the RC GILF. The GILF shows 1% min and 2.5% max for fat. To compare canned foods, you will need to convert to a dry matter basis since there is a difference in moisture content. On a dry matter basis, the GILF is 4% minimum and 10% maximum fat whereas the lowest fat TOW is a minimum of 16.5% fat on a dry matter basis and they do not state what the maximum is. This is a huge difference and I think it may be too high but check with your vet to be sure.
The other thing I wanted to mentioned is the GILF contains prebiotics and that is probably why he had a good stool on it and runny when you tried homemade. One food that I know is low fat and low carb is THK Zeal, however he would probably have a runny stool with it unless you tried adding THK Perfect Form or some other prebiotic/probiotic supplement.
Hopefully someone else will be along that can offer some food suggestions based on their experience.
