Do FAA endorsements have to use the current language word-for-word?
Here is verbiage from the FAA's AC 61-65G, appendix A, regarding endorsements. 

Also, in my view as long as the instructor's endorsement verbiage covers the essential elements in the regulation underlying the actual rquirement(s) that must be met, there are no mandatory words that must be used.  However, should a question arise regarding the action, level of proficiency, or other requirements specified by the regulation the instructor is attesting to, using the recommended language shown in AC 61-61G, appendix A, should eliminate any potential ambiguity.  

(emphasis is mine)


  The following examples are recommended sample endorsements for use by authorized 
  instructors when endorsing logbooks, or other means found acceptable to the Administrator for 
  airmen applying for a knowledge or practical test, or when certifying accomplishm
  ent of 
  requirements for pilot operating privileges. Each endorsement must be legible and include the 
  instructor’s signature, date of signature, certificated flight instructor (CFI) or certificated ground 
  instructor certificate number, and certificate expir
  ation date, if applicable. The purpose of
   this 
  advisory circular (AC) is to provide guidance and to encourage standardization among 
  instructors.