Its about same time period with same gpu models and HUGE diffrences shouldnt happen. Unless you think about winminer or some other crap that steals half your hash power.
If it would be 10-15% i would say ok but this isnt reassuring. Will see when payment received tho. maybe it doesnt show right since you didnt say anything about that :p
1. Bitcoin and especially Altcoin price fluctuations can be huge within a single day. So again, no comparison can be made unless you mine concurrently with the software you want to compare at the exact same time period.
2. Payments are guaranteed. Stay assured that you will receive your mined bitcoins when you reach 0.0025
confirmed BTC
Also, please use the latest version of UberMiner which indicates more accurately the time remaining until your payout.
Let us know the results after a few days of mining!

I was about to download the new version but if I uninstall and install the new version how will it know where it left? since there is no account or email associated.
How will it know its me and that I have mined 0.00162 BTC so far? Dont wanna lose 7 days of mining tbh.
Also, on your site the: End User Licence Agreement (EULA) page is not there. The link takes you to:
http://www.uberminer.org/page1.html that shows: 404 - File or directory not found.
The resource you are looking for might have been removed, had its name changed, or is temporarily unavailable.