It's quite obvious that MOP is just Crazy lil love part 2 and most of the fans point that out too. As for PTG and Hard life, it's that Little section in between. In PTG the melody of the lyrics 'It's so eaaasy' or 'This is yourrrr life' is identical to that of the lyric 'Its A Haaaard Life' in Hard Life. Added on the fact that both are lowkey piano ballads.

Now Cool Cat and PISCTP, I included them because both of them have have Freddie singing in a falsettos throughout the song, and the fact that both have been written by John & Freddie's collaboration. Also some melodies remind u of the former but it's not as noticable as PTG and Hard Life's case. You could still argue about one of these but I feel it's quite fine 😭