The data is exactly the same, NASDAQ just updated before OTCBB.
It would have been helpful if you had given that link with your original data. Out of courtesy to others I always give supporting links.
Here it is:
http://otce.finra.org/ESI
From the 16-29th the shorts were able to cover about two million. Note that days to cover has gone up due to low volume.
01/29/2015 GT ADVANCED TECHNOLOGIES INC C GTATQ Other OTC
10,460,238 12,449,272 -1,989,034 -15.98 1,137,620 9.19
OTCBB is still the only source of historical data that I know of.
Jan 15, 2015 12,449,272 -3.50 1,684,837 7.39 No No
Dec 31, 2014 12,900,921 -20.39 3,875,922 3.33 No No
Dec 15, 2014 16,204,582 -6.47 3,438,667 4.71 No No
Nov 28, 2014 17,325,889 -4.26 2,058,621 8.42 No No
Nov 15, 2014 18,096,433 -8.21 3,146,319 5.75 No No
Oct 31, 2014 19,715,700 100.00 17,682,173 1.12 No No
http://www.otcmarkets.com/stock/GTATQ/short-sales
Shares were covered from the 16-29.