Animal insulin is not the same as human insulin and does not give the same control of blood glucose levels

Could anyone expand on this statement?

"Animal insulin is not quite the same as human insulin and does not give the same control of blood glucose levels".

How does human insulin give better control of blood glucose levels compared to animal insulin?

Insulin makes it possible for glucose to get into cells, but first, the insulin must bind to the cell membrane. This is made possible by insulin-receptors on the membrane surface. Animal insulin molecules do not EXACTLY fit the receptors on the human cells, so animal insulin is less effective. Cow and pig insulin are very close matches, but they are not EXACT...

In short, human insulin controls our insulin levels better because it's, well... human.

The different insulins have different amino acid sequences which impact things like insulin-receptor binding, and availability within blood plasma. The pharmacokinetics (fancy word for the way the drug behaves inside the body) are different from animal insulin and human insulin. Also, because there will be an amino acid difference in animal insulin, it may not have the same binding affinity as the human insulin

We even have modified forms of our own insulin that biotech companies have made. Some allow the gradual precipitation of insulin to mimic basal insulin secretion rates while some variants are engineered to prevent insulin polymers from forming which would prevent the instant availability of insulin as it is injected.