Is all the data of a 144p video also stored EXACTLY same as in a 720p video?

Whenever i switch between 144p to a higher resolution its obvious i need to download more data to view the same youtube video. Suppose i have buffered the whole video in 144p and i switch it to 720p then it definitely wont play if i shut off my connection. However if i buffer in 720p and and then switch to 144p youtube again downloads the whole video in 144p cant it just convert it into 144p when it has more than enough data with the 720p. In short is all the data of a 144p video also stored EXACTLY same as in a 720p video? (i am aware there are softwares which allow you to convert resolutions but thats not my question)

Is all the information i have in 144p in a video present in 720p, what extra information is present in 720p?

Whenever i switch between 144p to a higher resolution its obvious i need to download more data to view the same youtube video. Suppose i have buffered the whole video in 144p and i switch it to 720p then it definitely wont play if i shut off my connection. However if i buffer in 720p and and then switch to 144p youtube again downloads the whole video in 144p cant it just convert it into 144p when it has more than enough data with the 720p. In short is all the data of a 144p video also stored EXACTLY same as in a 720p video? (i am aware there are softwares which allow you to convert resolutions but thats not my question)