Test E is a Form of Birth Control but Test C is Used for fertility?

So I bought Anabolics by William Llewellyns as a reference book and while flipping through different steroid profiles this caught my attention. “Test E has been studied with great success as a male birth control option. Weekly injections of 200 mg were shown to efficiently lower sperm production for most men.” Then I flipped to the Test C profile where it says its used to increase fertility. My understanding was that Test E and C were essentially the same thing so how does one increase sperm production and the other decreases it?

They don’t, both will shut T and sperm production off.

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