Why is it important that the unmutated pGLO plasmid is digested with the same restriction enzymes as the mutated pGLO plasmid

Lola needs to sign 6 invitations. using stopwatch that measures time to tenths of a second, it takes lola 5.3 seconds to sign her full name. going by the accuracy of the stopwatch, which is the most accurate determination for the number of minutes lola needs to sign all 96 invitations