Why Both Names Persist Side by Side
Because they reach different people. "Colour prediction" sounds like a game and appeals to curiosity. "Colour trading" sounds like finance and appeals to ambition. "Big small" describes a bet and appeals to people who already know what they are looking at. Same rounds, three audiences, and a marketing surface wide enough to cover all of them.
For a player the useful consequence is that advice written under one label applies exactly to the others. Understand what a win pays and how many digits your bet covers and you understand every version of this format, whatever the buttons are coloured.
The One Genuine Difference
Bet variety, and it works against you. A colour build usually offers more ways to stake on the same draw, and the additional options carry larger edges than the plain even-money call. The simplest bet on the screen is almost always the best one available — an unusual case where the least interesting choice is also the mathematically correct one.
For the arithmetic behind those multipliers, see the payout breakdown. For the round both bets settle from, start at the home page.