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no
Yes, they can
Yes, you can substitute the 205/75-15 for the 215/70-15.
Yes, that is a pretty good substitute.
No, that is a very bad substitute. If you want to go with a 70 series tire go with a 195/70-15 which is a great substitute.
Yes, they can
Yes, you can
Normally. yes.
Yes, this is an excellent substitute.
No, your speedometer will be 3 mph too slow. A 205/60-15 will be a good substitute with almost no difference in overall diameter.
Yes, that's a reasonable change.
Yes, they are only slightly different.