Night time pull ups do hold more pee than daytime pull ups do.
Night time pull ups are made with increased absorbent material so they can hold more pee during the night time.
Although for some kids even the night time pull ups may not be absorbent enough, especially if the child is a heavy wetter at night.
In that cases you may need to use actual diapers or even night time diapers such as Huggies overnites.
My 7 year old son wets heavy at night and he would leak through the pull ups even the night time ones so I started buying him the Huggies size 6 Overnites diapers which fit him really well.
They even now make size 7 diapers in Huggies and even size 8 diapers in Huggies and Luvs diapers.
Luvs size 8 diapers and Huggies size 8 diapers or size 7 depending on the age of your kid and their size and weight are even good for nighttime wetting or bedwetting in children.