First off, Welcome to the boards!
If i under stand this right (someone please correct me if I'm wrong), ignoring the difference in core the main change will be the the kinetic energy your ball transfers to the pins, since Kinetic energy = mass * Velocity, if you lower your ball from 14 to 13 and keep the same speed on the ball, you will loose Kinetic Energy and as such carry. however depending on how much your ball speed increases you can keep the same carry or potentially raise it.
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