No new fighters, stages, or major modes were added in 13.0.3. It is purely a polish and balance patch.
Replays from these versions are confirmed as not compatible. super smash bros ultimate nspupdate 1303 portable
Super Smash Bros. Ultimate v13.0.3 NSP/Update – Portable Perfection on the Go (and on PC) No new fighters, stages, or major modes were added in 13
Do you play Smash Ultimate on a portable device? Let us know your setup in the comments below. No links, just tips. No new fighters