That would be a terrible idea, if you use the same username.
Since each distro uses your home folder to store their configuration files, there would be a conflict and neither would function correctly.
A solution would be to have your pop OS to have a user1 and your Fedora to have a user2. i.e. John for Pop and Jack for Fedora.
But ultimately, what I would recommend would be the following :
When you install fedora, you don’t have to use a different partition for home. It only has to use a single partition for everything. (iirc, fedora uses a filesystem called btrfs which is very practical for these cases)
Let’s say your partition will look something like this
/dev/sda1 EFI
/dev/sda2 Win
/dev/sda3 Pop system
/dev/sda4 Pop home partition
/dev/sda5 Fedora (system+home)
And if you want a shared space between all the OS you would then have another partition
/dev/sda6 share partition (exFAT or NTFS or FAT32)