If a Doctor has had experience with Draeger Oxylog 3000 ventilators and goes to a hospital where they have Philips Respironics ventilators, it does not mean that the Doctor is no longer suitable for the job of being a Doctor looking after a patient on life support.
Somehow the decision makers would need to be able to see the issue here with pilots. A pilot has a skill set that can be applied across a variety of equipment (with appropriate associated training). Even if overall experience can be explained away and discounted they must surely be made to see that there is 'comparable' experience that should not be discounted when assessing candidates. The devil is in the detail...