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Yes, the activation thresholds for KMS clients are independent for servers and workstations. This means that you need at least 25 workstations to activate them using KMS, and at least 5 servers to activate them using KMS. In your first example, where you have 5 servers and 10 workstations, only the servers would be able to be activated using KMS, as the number of workstations is below the activation threshold. In your second example, where you have 25 workstations and 2 servers, only the workstations would be able to be activated using KMS, as the number of servers is below the activation threshold.
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