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PN diodes can be much more complex than a simple 2D model demonstrated in all the theoretical examples Can you provide any reference for your answer? The 1n diodes are a lot bulkier than the 1n if I remember correctly Once they do this they can sell the better performing devices for more money.
My guess is 2 pools, from which 7 bins were derived. This guess is based on the fact that the data for Typical Junction Capacitance in the datasheet has two regions. The difference between these diodes is mainly their reverse breakdown voltage. There are many more parameters which differ; part of the differences are mentioned in the datasheet like the aforementioned junction capacitance , others are not.
These properties must affect almost any electrical parameter of the diode. Manufacturers tend to represent these diodes as having exactly the same properties because the very fine differences are not important for main areas of employment of these diodes. There are applications which require more precision though. In these applications you might want to be able to choose a suitable breakdown voltage. My guess is that years ago, when these diodes were just introduced and the semiconductor processes were not mature, the differences between different diodes were more pronounce.
Summary: If the price is the same and you use these diodes in "standard" applications like low frequency rectification , you may use any of them as long as it satisfies your requirements for reverse breakdown voltage.
If you are planning to use them for something more sensitive, you might want to test them all to see which one suites better.
1N400x general-purpose diodes
1N4007: Standard Rectifier, 1000 V, 1.0 A
Diodes - Rectifiers - DO-214
10PCS SMD 1N4007 M7