The differences between Twinkle and Tsiku Marguerite are subtle, but here goes
1. Twinkle is a more compact grower. Tsiku is generally taller than a Twinkle.
2. Twinkle inflorescence are more densely flowered and have a tendency to be pendant. Tsiku has more upright inflorescence and the flower are more spaced.
Of course, this is easiest to see when they are side by side which I happen to have in my sun room right now.