BR,
Sako now makes all its own actions, short, med, and long. In the past, they used the FN action for their long action rifles and made their own short and medium actions. Browning used the long FN and medium Sako actions in their earlier guns. Sako actions were also used in other brands of rifles.
The Blue Book shows Sako rifles using FN actions listing for less than Sako rifles with the Sako L-61 long action. The L-61 Sako action was introduced in 1962, at which time Sako stopped using FN actions.
The Sako L-461 is a .223 length action and the L-579 is the medium, .308 length. That's a summary, as there were other designations during the evolution of these actions.
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