The videos that were made with a different phones can have a different file size.
For example:
If you make a 1 minute 30 FPS 4K video with Samsung S10, Samsung S20 and Samsung S24, the file size will be most probably different, because there may be used a
different codec and compression to make create these videos.
1 minute 4K video made with a recent Samsung phone (using a HEVC codec) have the file size:- 30 FPS - 730 MB
- 60 FP - 1.1 GB