Technically, yes. Your speedo will be way off however. Those tires will be a lot taller than what the computer is set up for. It will show that you are going much slower than you actually are.
Yes, they are
Yes, you can substitute the 205/75-15 for the 215/70-15.
No it will not. If I understand your question correctly, the tire you are looking at is 15" in diameter and your rim is 16" in diameter. You need to buy tires that are made for your diameter wheel, 16".
No. There is 4.34% difference in the diameter which is too much. Your speedometer will be off 3 mph. 195/70-15 would be a better swap for 215/60-15 tires. It will only be 2.3% off and the speedometer will be off only 1.4 mph.
215 x 70R 15
175/70r/13
NO, the rim size is different.
The original tires are 225/70R 16
Yes, that is a common size for that car.
235/75r/16 255/70r/16
Ideally you should have four tires on the car that match. With that being said you can certainly replace your 65r tires with 70r tires. The 70 refers to the width of the tire and a 70 is slightly narrower than a 65. The lower the number the wider the tire. I would not put 1 65 width tire on one side and a 70 width on the other side of the car, they will wear unevenly.
It is 215 mm wide at tread, could be any diameter. If a 15 inch, it will be designated something like "p215 70R 15"