I work part time at the town transfer station and a older 70hp Evinrude ('75-'92 ?)came in (didn't get model #) for disposal. Since I have a 70hp tiller (J70TTLEOR) I took the thrust bushing (318841) and 14x13 prop (391668) along with castle nut and spacer.

My 70 thrust bushing is (127084) which is about 0.115 thicker and my prop is 13.75x15 (391198)
Would there be any drawback about keeping the earlier prop and bushing for spares or was the changes significant enough not to hang onto them ??