Thanks for the answer..
Do you think it would be possible to have the same BB/ 100 hand on NL 50 that you had on NL 25?
It would seem not in my case. But you have to realise winrate is dependant on many variables, how well your running, how good a player you are, how many hands you play to have judge your winrate on and yes what limit your
playing. It is generally considered that the higher the limits you progress the tougher the competition. So if you are able to adapt and make subtle changes to your game then you should be ok. The difference in skill from 25nl to 50nl is probably marginal.
Just don't get into the thinking that if you beat one level at a decent winrate then you will automatically win at the next level up. It's not that exact a science I'm afraid.