[davchana]

Yes, and am I correct in assuming that once the transactions.txt is copied to transactions2.txt, they are same only till that point of time (or block), and can have totally independent and different entries from that point onwards?

If copy was made at block 55, 55th block is same in both branches. 56th and such blocks can be totally different. Imagine it like a literal branch of tree. Both branches share the same trunk, but are unique once seperated into unique branches.