Good morning,

I use OpenpgpJS to create gpgkeys (RSA 2048bits). I forged public and private keys :
I use SKS keyserver and when I send my key, It's resulting that keys doesn't corresponding.

Is someone have an idea why the final public key is different of what i have send ?

Keys here : https://pastebin.com/raw/0mfArygL 1. is the public key giving by OpenpgpJS 2. is the private 3. is the key resulting by SKS.

I observed that key start always by the same digits corresponding to the type of keys but i really don't know how key are Armored technically.

Those two public keys are the same, it is just that SKS has re-encoded the packets to the new-ctb (new cipher type byte) format, and the content of each packet is identical.

You can use gpg2 to show the packet format
gpg2 --list-packets -v file.asc

You will also find that if a public key has signatures added, then the file will change (though this is not the case here). What really matters is that the keys are the same (and so the fingerprint is identical).

[I'm assuming these keys are just an example, since you've posted the private key too.]

Thanks you Neonsignal, that's solved my problems. (They keys given was for the example)