Yes they can be interchanged and changed out. When doing this change one must make sure they are changed out in equal pairs. The two fronts and two backs have to be changed at the same time in order for it to work. One may also need to change the axle in some extreme conditions.
Yes, they can
Yes, they can
Yes, this is an acceptable swap.
Yes, but your speedometer will read 1.5 mph fast.
Yes, this is an acceptable swap. Know that your speedometer will read 59.3 at a true 60 mph.
Yes they can. You do realise this gives less tread on the road, which is not always a good idea,
Usually The tread is 10 millimeters wider and the tire is 12 mm taller overall but mounts on the same wheel
No, the 185 70 r14 tire cannot be substituted for a 175 65 r14 tire. The 70 series tire has a larger diameter and is not recommended that you substitute on a 65 series tire.
No
Yes, that is reasonable.
185/70 r14 88 s
Definitely no.