The coincidence of the shared birthday between Tchaikovsky and Brahms practically begs further inquiry into what other similarities these two composers may have shared.
Whilst you’re thinking about that you may not know that Hendrix and Handel used to house share in London, just not at the same time…
Not sure even Roon’s excellent metadata can make that link.
Musically, in view of the fact they produced music roughly about the same time, they could not be more different to my ears. Tchaikovsky’s works are highly melodic and emotional. Brahms sounds technical and very formatic, and, like Beethoven, often big (not necessarily loud but substantial).