Hi everyone, first time flying CX, and have a general question about lounges.

I am flying F from JFK-HKG, followed by J from HKG-SIN in a 2-class regional 777. Flight numbers are CX841 and CX 711.

Question, which lounge should I be using? I know CX operates 4 different lounges, so naturally I am confused. Also, will I be entitled to use the F section of the lounge even though my onward jouney is in J? Is there any significant difference between the F and J sections?

Thanks!