Originally Posted by SoSmellyAir

In my experience from a prior attempt to build a custom cassette by combining cogs from two cassettes, even if the suffix of the individual cogs match, there could still be shifting issues.

Bike Forums - View Single Post - Custom 12-28 cassette

If you view your cassette from the rear and slightly to the side, as you rotate the cassette, the light hits it at a certain way when all the shift ramps are lined up, at least between the cogs with only a one tooth jump.