The inner and outter diameter is the same, but EG is a taller spring. You would have to cut it to make it fit, or if it was a really low spring type you may get it to work. It just may not drop it as much as you think.

The spring rates are different, the EG front springs are longer than the EFs and they just stright up will not work (correctly that is).

Now if you are trying to use EG coilovers (sleeve kit only) on EF suspension then that will work. It wil l be a stiffer spring rate