Even last version most civs would have the same colour eyes, hair and skin.
I suppose if you want to simplify scientific testing, you should edit the raws for less variations, or simply name them as numbers. For example hair:
[TL_COLOR_MODIFIER:AMBER:1:AUBURN:1:BLACK:1:BROWN:1:BUFF:1:BURNT_SIENNA:1:BURNT_UMBER:1:CHARCOAL:1:CHESTNUT:1:CHOCOLATE:1:CINNAMON:1:COPPER:1:DARK_BROWN:1:DARK_CHESTNUT:1:DARK_TAN:1:ECRU:1:FLAX:1:GOLD:1:GOLDEN_YELLOW:1:GOLDENROD:1:LIGHT_BROWN:1:MAHOGANY:1:OCHRE:1:PALE_BROWN:1:PALE_CHESTNUT:1:PUMPKIN:1:RAW_UMBER:1:RUSSET:1:SAFFRON:1:SEPIA:1:TAN:1:TAUPE_DARK:1:TAUPE_GRAY:1:TAUPE_MEDIUM:1:TAUPE_PALE:1:TAUPE_SANDY:1] [TLCM_NOUN:hair:SINGULAR] [TL_COLOR_MODIFIER:GRAY:1]
The gray at "TL_COLOR_MODIFIER" at the end I guess is for aging, so older dwarfves start having strands of grey hairs at round 80 years of age. Dunno if even older dwarves go completely gray, but probably.
skin:
[SET_TL_GROUP:BY_CATEGORY:ALL:SKIN] [TL_COLOR_MODIFIER:BROWN:1:BURNT_UMBER:1:CINNAMON:1:COPPER:1:DARK_BROWN:1:DARK_PEACH:1:DARK_TAN:1:ECRU:1:PALE_BROWN:1:PALE_CHESTNUT:1:PALE_PINK:1:PEACH:1:PINK:1:RAW_UMBER:1:SEPIA:1:TAN:1:TAUPE_PALE:1:TAUPE_SANDY:1] [TLCM_NOUN:skin:SINGULAR]
and eyes:
[SET_TL_GROUP:BY_CATEGORY:EYE:EYE] [TL_COLOR_MODIFIER:IRIS_EYE_AMETHYST:1:IRIS_EYE_AQUAMARINE:1:IRIS_EYE_BRASS:1:IRIS_EYE_BRONZE:1:IRIS_EYE_COBALT:1:IRIS_EYE_COPPER:1:IRIS_EYE_EMERALD:1:IRIS_EYE_GOLD:1:IRIS_EYE_HELIOTROPE:1:IRIS_EYE_JADE:1:IRIS_EYE_OCHRE:1:IRIS_EYE_RAW_UMBER:1:IRIS_EYE_RUST:1:IRIS_EYE_SILVER:1:IRIS_EYE_SLATE_GRAY:1:IRIS_EYE_TURQUOISE:1] [TLCM_NOUN:eyes:PLURAL]
In one of the old versions I edited the skin raws so dwarves would have skin tones named after rocks. Granite, obsidian, microline, etc.