Not that I know.
I only found a Russian language thread at 4pda-to, where they compare hardware
GTMEDIA GT Combo
CPU: Amlogic S905X3 Quad-Core ARM Cortex-A53, 18,400 DMIPS
GPU: ARM Mali-G31 MP2, 850 MHz
RAM: 2G DDRIII
ROM: 16G EMMC
MECOOL K5
CPU: Amlogic S905X3 Quad-Core ARM Cortex-A55
GPU: Mail-G31 MP2 GPU
RAM: 2 GB
ROM: 16 GB
But I see myself buying one GTCOMBO.
And since I am buying one anyway, I will try to see if I can boot the current kernel ( boot.img/recovery.img ) to a working state , then see if i can "Kexec" to the external SDCard with a custom build enigma2. Just as I do run Debian from Android boot.img/recovery.img on old phones. if I do not get help from GTMEDIA with their official kernel sources then my future plan B will be that. It is just a personal project just to see how far I get.