Buy them. But stick with black.
I remember an interview at hope where they said that black was the more robust anodized medium compared to the others.
Light green or team green as everyone knows fades very quickly, red fades to a not so nice pink and the bright sharp blue dulls down.Orange seems to last well, as does purple.
So black as the base and ano master cylinder lids and caliper bore caps. Adjusters in the chosen ano also are a better deal than a complete lever which is prone to wear and from falling off. Plus having the base black means you can change the coloured accents as the mood takes.
Comparing the two levers, they’ve done away with the tiny circlip on the T3 lever pivot for a nut on the T4 pivot, but its still a pain in the arse getting the tiny c clips off the adjusters.