Both are authentic. The second hadeeth states that it is most likely in the last 7 nights but doesn’t limit it to these nights as it can be in the other three as well.

I have received mail which says: ” Â’ishah relates that Allah’s Messenger (peace be upon him) said: “Seek out Laylah al-Qadr in the odd nights during the last ten nights of Ramadan.” [Sahîh al-Bukhârî(1913) and Sahîh Muslim (1169)]

Fasting | March 30, 2014 10:37 am
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Sheikh, i wanted to know that i make up my fasts on mondays and thurdays and every month of 13,14,15,so i will get reward of both things like i will get reward of sunnah & my fast will make up or i have to fasts separately for getting reward of these nifli fasts?

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Dear Shaikh, you rightly said we are told to break our fast when we see the sunset but nowadays in cities with large large buildings it is very difficult to see the sunset? Now in this condition can we follow the Salah timetable by increasing 2-5 minutes as precaution to break our fast?