Lord of the rings uses 5020 coils. Spiderman uses 5032. You don't want them to be the same. Lord of the rings has ramps on the back of the machine like the ring ramp and the left ramp. This requires stronger coils to work.
Spiderman has a lot of close up shots. If you make the coils stronger then the game will become much harder. Shots are close. The target bank for say sandman will bounce back at you way too fast. The shot to doc oc will bounce out rather than stay in. The flippers need to be strong enough but not too strong. You should be able to hit the left and right ramps with either flipper. It does require an accurate shot but it should be possible. That is how the game is intended. You definite do not want to replace your coils in that game.