2 different admob account - same app - different clicks - same revenue WTF!!

hello people
i have 2 admob accounts and i added those accounts on the same app , one of those account gets clicks between 1800 and 2000 per day and the age of this account is 4 months , the second one gets between 500 and 700 clicks per day and the age of this account is 1 year
the strange thing that , the same users and the same app with same revenue , anyone faced like this situation before ? is the age of the admob account has any effect on the revenue ?
thx in advance