Download comes with both files of both images in 2 different ratio sizes. The ratio depends on what size you are going to print. Here are the different sizes that go with each ratio:
3:4 ratio for printing:
Inches: 6x8 | 9x12 | 12x16 | 15x20 | 18x24
4:5 ratio for printing:
Inches: 4x5 | 8x10 | 12x15 | 16x20
The files are named with the highest ratio size, i.e. 16x20 and 18x24.