If you buy a replica from noob factory which is one of the best replica builders you won't see any difference. Even the laser logo at the 6 o clock position is there. Fot this ultimate AAA+ version you have to pay 200-600 USD, but it's every penny worth. I have my GMT Master 2 since 2 years now and there is no scratch or something other issue.
There is only one difference between a original Rolex and a replica.
One is made in Switzerland and the other made in China - That's all