Cologne vs. koelnerphonetic - What's the difference?

We're currently adding phonetic search support to our application by extending our elasticsearch mappings. As we have a german customer, we want to apply the cologne phonetic algorithm .

When I check the available phonetic encoders (see, I see that there are two encoders which very likely refer to the same algorithm -> namely " koelnerphonetik " and " cologne ". Both seem to be based upon the cologne phonetic algorithm.

I am a little bit confused by these two encoders as they appear to be the same. Is there a specific reason for having these two encoders? How can I identify which encoder fits better for me ?

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