Determine the relationship between the two molecules shown

To determine the relationship between the two molecules shown, we need to examine their structural similarity and differences. If the molecules are mirror images of each other and cannot be superimposed, they are enantiomers. If they have the same connectivity of atoms but differ in the spatial arrangement at one or more stereocenters, they are diastereomers. Let's analyze the structures:

The two molecules shown are:

Molecule 1:

Molecule 2:

Both molecules have the same structural formula: ${\text{CH}}_3{\text{CH}}_2\text{CH}({\text{CH}}_3){\text{CH}}_2{\text{CH}}_3$