You'll find differing opinions on this, but I ran a 12v system with a 12v coil for years with two resistors, the ceramic one and the coiled wire version, in series. And it cranked and ran fine and points lasted several years. Last year, I converted further to Electronic Ignition, and I'm pleased with that, too (but I saved my points plate just in case!). Mine is a 48 8N. I don't think you're risking much either way, but I would use the resistor you bought, and I expect it'll run fine.
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