This Malaysia this track-only car has a metal body with a plastic base, int., and canopy.
a. mf green, black base and int., tinted canopy, sp10bk. HW Exotics #235 1 – 2
b. white, black base and int., tinted canopy, red stripes on top and sides. sp10bk. Mal. Factory Fresh #88 (2020) 1 – 2
c. candy dk. red, as a, silver stripes on top and sides. Ra6bk. Mal. Red Edition #88 (2020) 1 – 2
d. mf blue, black base and int., tinted canopy, details, sp10bk, Mal. Multi-pack only (2021) 2 – NA
e. mf orange, satin black metal base, black int., tinted canopy, details, rr10spbk, Th. Exotic Envy #2 (2021) 3 – 6
f. burnt orange, black base and int., tinted canopy, sp10bk. Indo. Motor Show 5-pack (2022) 2 – NA
g. zamac, black base and int., tinted canopy, sp10bk. Mal. Zamac 6 Car Gift set (2023) 3 – NA
The orange variant, RRTA8BK, actually is a relatively upgraded (metal underside, wheels, coloured air intakes, probably printed roof pattern) model and part of the so called “premium” and “exotic envy” lines, as you noted here:
https://archive.hwcollectorsnews.com/2021-premium-car-culture