I don't know about T2s but T1s vary a lot in our responses to exercise, alcohol, different kinds of carbs, stress, illness, and hormone fluctuations. I'm not talking about our psychological responses but our physical responses - the way our blood sugars fluctuate. Different people also respond in very different ways to different kinds of insulin, and insulin itself changes the way it acts at different blood sugar levels in different people. As for hypo symptoms - there are some similarities between T1s but to be honest there are more differences than similarities.
On a very basic level, yes, we're all the same, insulin brings our blood sugar down. But if you are trying to fine tune it then all the differences really do come into play.