The OMC master model listing shows there are 4 different model number for Evinrude 60 hp engines that year: 60072B 60072D 60073B 60073D.
OMC's master book is not any more specific that just that information. You might be able to check out the OMC original factory parts lists variances on their factory website: epc.brp.com. With you engine in front of you, you could compare the 4 parts lists with your engine. Some major differences you may easily find: tiller handle vs remote control, short shaft engine vs long shaft, even electric start vs pull cord. Generally, I think you'll find most of the major parts are identical, in terms of carbs, powerhead and ignition components.