African GB member:
In almost all cases the new BOE will know everything about your past when join a new congregation.
Your publisher card will be accompanied by a letter including all the juicy details about your past. The individual elders from your old congregation, if they personally know any elders in your new congregation, will most likely gossip about you and reveal private things about you to their friends in your new BOE. That is how it works. It is rationalized under the facade of sharing information so that the new BOE will be better equipped to "help" you.
It is not really possible to start a "new life" in a new congregation.
Unfortunately this is one of the unpleasant by-products of being a part of a cult masquerading as a religion.
The only new life you will ever truly achieve is the one you will enjoy after you extricate yourself from the bonds of the WT organization.
And that is the truth.
The Oracle