Difference between memorandum revaluation account and revaluation account

In the partnership accounting, at the time of retirement or admission, we either make revaluation account or make memorandum revaluation account but we should know the main difference between both

1. In memorandum revaluation account we make reciprocal entries in same account for covering double record system but in revaluation account we make only one side record.
   
2. In memorandum revaluation system of accounting, we can not change the value of assets or liabilities outside because all the procedure of double record is completed in memorandum revaluation account.
   
3. In memorandum revaluation account , first we divide profit or loss on revaluation is in old profit sharing ratio among all partners but after reciprocal entries recording we divide partner in new profit sharing ratio but in revaluation account we only divides in old profit sharing ratio
   
4. Making of memorandum revaluation account is not necessary but making of revaluation account is very necessary .