The difference between a Type 1 and a Type 2 is the bodies use of insulin. In Type 1s the body has quit producing insulin. In Type 2s the body is insulin resistent or simply does not produce enough insulin to counteract the carbs being eaten and converting them into energy.
As a result of this, all Type 1s need to take insulin were some Type 2s can manage their diabetes with simply diet and exercise. Some Type 2s need to take oral meds and some need to take insulin as well. The most important things to do for all diabetics is to eat right and exercise as this will help you to more effectively manage your diabetes.
The same tests can be used to determine diabetes but another test, c-peptide, is used to determine which Type a recently DX person is.
The symptoms can be the same and in some Type 2s symptoms ar enot even present.
I hope that answers all your questions and do not hesitate to ask more. Is there a particular reason you are inquiring?
Anybody that is more experienced than me with Type 2 can feel free to correct me.