The initial QR code isn't a TOTP code, it contains the secret used to generate the TOTP codes.

You can absolutely scan the QR code with multiple authenticator apps (or copy paste the seed value into them) and they will all produce the same codes in the same order going forward.

The QR code contains the TOTP key, which is the seed that's used to generate the codes, which form a time-based pseudorandom sequence.