In my opinion, you should use the FAR 1.1 definition of night time when meeting the requirements of FAR 61.109 (a) (2) for your PPL.
Then use FAR 61.57 (b)(1) when meeting the requirements to carry passengers (1 hour after sunset to 1 hour before sunrise as published in the Air Almanac).
Keep in mind that the required FAR 61.109 (a)(2)(ii) 10 takeoff and landings are to be done in accordance with the night definition contained in FAR 1.1., not in accordance with the 61.57 night takeoff and landing
experience requirements to carry passengers (to be done 1 hour after sunset to 1 hour before sunrise as published in the Air Almanac).
These two separate regulations should not be conflated. When satisfying each regulation a night time takeoff and landing (per FAR 1.1 definition) for 61.109 is different than the takeoff and landing requirement in 61.57, which is 1 hour after sunset to 1 hour before sunrise. These two different regulations are met only within the meaning of each separate paragraph (61.109 and 61.57).
Importantly, For PPL training if you do your "night" takeoffs and landings at or just after civil twilight, but before 1 hour after sunset (for example) you will meet the 61.109 requirements but may not meet the 61.57 requirements.
Of course, effective timing of your flight time and takeoffs/landings can be done so as to meet both 61.109 (a)(2)(ii) and 61.57 simultaneously.