If you never made any changes to that file, and your system works, then it can be removed.
This is also parcel to understanding what the things are.
A pacsave is the same as a pacnew but in reverse.
It is a file that would otherwise be removed or overwritten, but is saved as ‘*.pacsave’.
Also, as it now has the pacsave extension, the file itself is no longer functional in its original purpose.
You can review and remove or even reinstate as necessary.
In this case, I find it unlikely you should do anything but allow its removal, as would be facilitated by regular management of such files through pacdiff -s.
This and more is covered in the guides