in a fixed wing you can do this same check with a instructor not a examiner [what is this check called ?]
No, you cannot do any form of test or LPC with an instructor. There are two methods of revalidating a SEP or TMG Class rating, one is to do an LPC with an Examiner exactly as you do on a helicopter, the other is to revalidate by experience. One of the experience requirements is to have completed a dual instructional flight of 1 hour with an instructor. That is not a test and does not revalidate the licence, it is simply one of several "Experience" requirements. It still requires an Examiner to sign the revalidation. There is no change to this under EASA.