Same CPU. Same motherboard size. Two different methods.
ZOTAC went for an internal CPU cooler while
MINIX designed a proper heat sink case. ZOTAC’s method hides heat from end users while the MINIX can be seriously hot to the touch. Although it can be worrisome at first (it’s fine) convection is unobstructed with the MINIX, and it shows, especially under OCCT. Special thanks to Thony for the pictures and comparison.