points question...series 3 2.25 petrol

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Curious if these points interchange for my 72 series 3...one with the small nut is what came out of my distributor...found the slide type and corresponding condensor in some spares that came with truck...or do I stick with the one i had. Getting all new ignition parts for my project and parts are listed as new style, late and early.. My cap, rotor i matched to what I had on distributor both being listed as late style but seems like i have early points...just trying to sift through the confusion...new to these rovers. Thx much