Difference Between HatsanTR and HatsanUSA

Hi
In HatsanUSA, the chart shows the maximum fps 850 for 135QE .25 cal:

https://hatsanusa.com/products/mod-135-vortex-qe

1544906641_10914569035c156791c8ee17.61968508_Screenshot_2018-12-15-23-26-03-723_com.android.ch...png


But in Hatsantr, the maximum fps is 750:

http://www.hatsan.com.tr/en_mod_135qe.html

1544906742_8481267995c1567f6274421.12181825_Screenshot_2018-12-15-23-44-30-450_com.android.chr...png


Which of these is correct and reliable?
Thanks.