Epinephrine is a small molecule. It doesn‘t matter where you get it from. If it is pure it is identical.

Doesn‘t matter what animal, planet or universe you get it from.

Insulin for example is different, because that‘s just a class of peptide hormones, not a specific one. Meaning human insulin is slightly different from say a pigs insulin. It still works the same on insulin receptors, but it‘s different enough that sometimes your immunesystem might go ‚wsit, this doesn‘t look right, let’s destroy it‘.

But you can also make human insulin through genetic engineering from E. coli bacteria or yeast, that molecule will be identical to the insulin your body produces.

Just modern insulins are modified more heavily, cause actual human insulin only works well if it’s secreted continuously at the correct levels. And not just once you eat food/measure your sugar levels.