if i change the the client id in the adsense mambot, will the stats and payments be reported in my other account? or do i have to use this client id? also, if i have to use this id through the mambot, how do i veiw the stats?
Generally Google AdSense allows one person to have only one account. If you have two personal acounts, you risk losing them both
Assuming that the 'other' account belongs to someone else:
Do not allow ads from 2 different accounts to be on the same page.
Coming to your query -
1. AdSense client ID is what determines where your payments are deposited.
2. When you want to track the performance of a particular ad, use