Common chart of account vs group

hi Experts,

My client has two company codes one in Uganda another in Kenya. Currency, fiscal yr is different. I have created common chart of accounts at chart of accounts level and assigned the chart of accout to both the company codes. Becuase of new GL(ECC 6.0) currency and posting period is autmatically set up though I used the same Chart of accounts in both the company codes(separate country). I am posting documents in each company codes with correct currency and fiscal year.

Common chart of accounts(SALL)

Assigned to SAL1(currency-UGX,feb-jan-F/Y)

Assigned to SAL2(currency-KES,Aug-july-F/Y)

Now my question is am I need to create again Group chart of accounts and assign it to the Common chart of account?

Anyone kindly suggested, correct answer will be appreciated.