found the issue ...

memory are the same, manufacture date, ... everything the same BUT ...
for unknow reason GPU1 is not accepting the same OC as the GPU 0 ...

i have lowered little bit OC and for now seems to be ok

ETH - Total Speed: 27.994 Mh/s, Total Shares: 3, Rejected: 0, Time: 00:21
ETH: GPU0 14.154 Mh/s, GPU1 13.839 Mh/s
 DCR - Total Speed: 466.564 Mh/s, Total Shares: 21, Rejected: 0
 DCR: GPU0 235.907 Mh/s, GPU1 230.657 Mh/s


Thank you for help