What matters is the travl direction of the pushrod system. If the servo pushes te rd directly parallel to the centerline of the airplane... the rod can be off to the side any amount you want. the man rod can be a straight line from the servo to one elevator half... then add the fork to the other elevator half and it will give equal throw.

If the main pushrod is pushed at an angle to the fuselage centerline... then the throws will not be equal. It won't matter if the forks of the rod are identical or not.

How unequal? that depends on the angular devitation. A long pushrod with a low angle and close spacing between the control horns at the elevator... you may have trouble measuring it with a micrometer. A short rod at high angle and wide spacing between the control horns you can get one side to throw double what the other side does...

The ideal, direct parallel situation s virtually impossible (the servo arm moves the connectin in an arc... the control hors move the connections in arcs...) But you are normaly going to be closer to the un-measureable difference than the outragous difference.