I would think that it was intentional that all the members of Queen's songwriting and music influenced one another, including Brian, John, but in particular that more so, it seems that Roger's work and Freddie's work influenced (and complimented) one another.
I think they enjoyed working together and sort of showing an appreciative nod to one another's work if you look at the similarities and parallels in their work.
Roger's 1st solo album was called "Fun In Space", but the next Queen album was called, (which Freddie and the entire band had a hand in naming I would think), "Hot Space".
Freddie's self composed song off his "Mr. Bad Guy" album was called "Made In Heaven", but Roger's next single with The Cross which Roger sang lead on the single version, but Roger asked Freddie to be guest lead vocalist on the version for The Cross' album "Shove It", was called "Heaven For Everyone".
Freddie wrote "Love Of My Life", one of the most meaningful Queen songs, with the lyrics "I still love you" which he spoke at "Live At Wembley Stadium", Roger wrote "These Are The Days Of Our Lives" also one of the most meaningful songs Queen has done, for which Roger wrote the lyrics "I still love you" that Freddie speaks at the end. (and both songs reflect on love as a constant throughout life, looking back over time).
And then even just working together, Freddie asked Roger to appear in his "The Great Pretender" video too, and the 2 enjoyed dressing up in drag (along with Peter Straker).
I think Freddie & Roger personally (I've heard the 2 particularly enjoyed the party life and kidding around with one another) & professionally,
that Freddie & Roger were really in synch with one another and sort of would take turns complimenting one another by these artistic similarities and collaborations in their work.
It's just really nice that they had such regard and esteem for one another.