No. An applicant who holds a Class 1 or 2 pilot medical certificate would almost certainly meet the medical requirements for cabin crew. However, a pilot medical certificate can only be used to validate a pilot licence and does not, for example, give details of the validity period for a cabin crew medical report. A member of cabin crew must hold a Medical Report issued in accordance with MED.C.030.
An applicant who requires a cabin crew Medical Report and already holds a Class 1 or 2 medical certificate should be advised to discuss this with the AME who issued the medical certificate. If the AME is willing to issue a Medical Report on the basis of the previous medical examination, the date of that examination should be used when completing the cabin crew Medical Report.