Yes it can.
yes. anytime. makes 1 cm difference in with of the tire.
If they have the identical aspect ratio and wheel diameter as comparing a 215/70-15 to a 205/70-15 the 215 tire will be .56" taller.
No, it will not.
The width, by 10 mm
Yes
yes
NO, absolutely not. Never, ever, mix tire sizes on the same axle. You could put a set of 215 on the front and then a set of 205 on the rear but not a 205 & 215 on the same axle. Tires on each axle must be the exact same size.
I doubt it as there is 2" difference in diameter.
The chart on the related link indicates that the diameter of these tire sizes is different. See it for more information.
205/65/15 or 215/65/15
Can you put a 215 70 r15 tire and a 215 65 r15 tire on same car
The 205 60R is a narrower tire than a 215 60R 15, however they will probably both fit the same size rim.