The phrase "a completely different skill" is correct and usable in written English.
You can use it when discussing skills that are not related or are distinct from one another.
Example: "Learning to play the piano is a completely different skill compared to playing the guitar."
Alternatives: "an entirely separate skill" or "a wholly distinct skill".
The backcourt position entailed a completely different skill -- throwing.
The practice of paediatric radiography requires a completely different skill set to that of adult radiography.
Giving Reyes a chance to replace Wright makes no sense from a baseball perspective, because Reyes has never played third base, and, beyond that, has a completely different skill set from Wright.
These guys are heroes, but the skill set required to extinguish a fire is a completely different skill set from that required to investigate it.
But he adds that the VCs have no "track record" in that area and that mezzanine financing as compared to "value-added investing" requires "a completely different skill set".
Ball-carrying off your 10 is a completely different skill to running off nine and Wilson has the ability to do this where others in the forward pack are more suited to the tight stuff.
Students will inevitably find themselves speaking to people who have completely different skill sets and interests, making for a varied university experience that helps shape you as an individual.
There is also evidence that people who work repetitive jobs can make the transition to jobs that require completely different skill sets.
No. Recreating growth requires completely different skill sets, and most companies chose substitution not evolution: They just tried to revise the existing templates for managing growth, taking them to new markets.
You don't just take a salesperson and make them a sales manager, because those are completely different skills.
If you are the leader, you will need completely different skill-sets and talents than if you are a minor contributing member.
