There is no difference as generalizability is a part of external validity of studies .This is explained below -
In order to determine if we can apply study results to patients who are not study participants, the concept of external validity is used.
Generalizability and application are two distinct sub concepts that make up external validity.
The issue of generalizability arises when there is worry about extending sample results to the population from which the sample was taken.
The issue of applicability arises when it comes to employing conclusions gained from research participants in the treatment of particular patients who belong to any group.
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