Another starter question

Did some searching and can't find an answer anywhere. I have a 460/c6 in my 1979 bronco. I'm needing a starter and it looks like the newer style starter is recommended so I bought one for a 1995 F350 460 with an auto. The new starter has 10 teeth on the gear but my old one has 9. Did I get the wrong one or will this work? Thanks in advance.

Both will work for sure but one is a higher torque starter with gear reduction but I'm not sure how to identify them. I usually order from D&B electrical.

I ended getting one from O'Reilly for the lifetime warranty and ease but wasn't sure if the extra tooth would hurt the flex plate. Thanks for the reply.