In chess, pawn can promote to any other chess piece except King and get all the corresponding abilities and power. Similarly, in High School DxD, when Pawn promotes, their power level increases and they get other abilities also. For example, when Issei got a direct hit from Yubelluna's attack, he was protected by the Queen Protection abilities.
Let's take Issei's promotion to Queen (Akeno) as an example.
Are the abilities and the increase in power level the same for all the Pawns regardless of the power and abilities of the actual Queen (Akeno), or do they depend on that of the Queen?
And if Issei is King of his pieces and promotes himself to Queen, gaining abilities and power from both King and Queen pieces, will he be more powerful than Akeno?