It's not that simple, cyco. The L1A is a low RPM fan that is designed to produce the maximum airflow at that speed. Taking an M1A and reducing the RPM will produce less airflow than the L1A and/or have more noise than the L1A. You are better off buying a fan that is designed for the target speed (unless you have a fan speed management system).
So, buy an M1A if you want to run it at the higher speed sometimes. Otherwise, just stick with the L1A if you are just going to undervolt the M1A.
The fan manufacturers use modeling software to design the fan blades for a targetted RPM. I trust them a lot more than me!
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