Rating 2.0 is calculated using 17-18 different factors. It already includes Impact rating, team contribution percentage (KAST), ADR, damage difference per round, K/D, Entry kills, 1vX clutches, success rates, and 7-8 more factors. All these different stats are combined together, with appropriate weightage for each factor, and one single number is obtained, which represents everything. That number is rating 2.0. If 2 players have same 2.0 rating, it means that in some factors, one player is ahead, while in other factors, the other player is ahead. But combining all factors appropriately, they are same.