Kadee split into two parts some years ago, the N and Z company is now called Micro-Trains. Same high-quality products. There are conversion charts on this page
For newer models, the charts are not always up-to-date, but the company seems to respond quickly to questions.
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Being new to N scale, I bought a Kato SD70ace and a few Atlas freight cars. Love the Kato loco, but the stock couplers do not work well at all. I want to change them out for couplers similar to the Atlas magnetic couplers. I gather from reading that I should be going for Micro Trains couplers (is that what used to be Kadee?). Can anyone tell me which couplers I need for the SD70ace? Thanks.