Thank you for detailed answer . I understand that a pool will not send the same work, and now I understand that even 2 solo miners with the same conditions will not get the same work .
My question is if it is the case what happens?
..
however if you are a solo miner. making your own block and you had a friend who you want to work on YOURBLOCK well.
you can do any pattern or splitting you like.. and yes you can tell your friend to start at the same sequence as you..
.. but why would you want to.. your doing double work and just wasting each others time..
.
In this case for example...
in this case
you are. as said. being silly by YOU choosing to set your mining script to both do the same work. and waste your friends time.
your friend will probably get angry at you for wasting his time, and tell you to change your silly mining script to offer him a split of the sequence your not working on, for the next time you both want to work on the same next block..
..