My suggestion is this.. Change Nothing
get them fixed and enjoy both as they are.
The speakers are different color, the speaker mesh is different too.
the Radio-Tuner panel is also different..
Of course they share parts but the Minty one is rarer than the one pictured last.
I have both. Maybe they are 1st and 2nd generationTRC-920's .
They also released a 920-T Gold Version and a 920 in Black version.
Lasonic has also different versions of the TRC-918 models. They also made different versions of the TRC-922 .
plus as i discovered lately differences also exist in TRC-935 models.