O que mudou entre duas versões?

curl -X POST https://api.kit.forhosting.com/text/compare \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"a":"El gato está en la alfombra.","b":"El felino reposa sobre el tapete."}'

const res = await fetch("https://api.kit.forhosting.com/text/compare", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "a": "El gato está en la alfombra.",
    "b": "El felino reposa sobre el tapete."
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/text/compare",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "a": "El gato está en la alfombra.",
    "b": "El felino reposa sobre el tapete."
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/text/compare", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"a":"El gato está en la alfombra.","b":"El felino reposa sobre el tapete."}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"a":"El gato está en la alfombra.","b":"El felino reposa sobre el tapete."}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/text/compare", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)