The only way to get a proper match is to have the paint custom mixed. Even though the motor is in excellent condition the original paint is over fifty years old and has probably faded some in that time.

Try this.

You have probably seen a OMC paint chart for the different years ,it also has the manufacturers(PPG?) paint code # so you could go and get it mixed elsewhere. Yeah the factory paint fades over the years. After i sprayed the BRP spray can version the first time, i think they sold me the wrong shade of Evinrude blue. Checked the can PN# with the chart or in the parts book. It is the right one. Faded factory paint. It really helps to shake the heck out of the cans,then set them down awhile inverted,wait then shake again for a total of 3 minutes or your arm falls off,which ever happens first. Then shake once a minute while spraying. The one minute total instructions on the BRP label doesn’t do it. Especially with the metallic paints. There was a service bulletin put out on the subject,due to unhappy consumers most likely.
I will be switching to the Reprotint spray cans from now on.