When I tried to relink an already placed JPG in my InDesign CC 2019 file with a larger version of the same graphic with another file name, the Links panel showed the new file name and the new graphic size, but the placed image in my InDesign file remained the same.

For example, the original graphic was 1" wide and the new graphic was 3" wide. When I relinked the 1" graphic to the 3" graphic file, the image in my InDesign file still showed the graphic as 1" wide even though the Link Info showed the new file name and the new graphic size.

This means that I have to re-place the entire image and redo all of the "effects" connected to that image, which is a lot of work in a book with many images!