Do brackets make any difference?

Algebra Level 3

(543)21×5(43)21=5b;b= ? \Large\left( \color{#3D99F6}{5}^{\color{#20A900}{4}^{\color{#69047E}{3}}}\right)^{\color{magenta}{2}^{\color{#EC7300}{1}}} \times \color{#3D99F6}{5}^{\left( \color{#20A900}{4}^{\color{#69047E}{3}}\right)^{\color{magenta}{2}^{\color{#EC7300}{1}}}} = \color{#3D99F6}{5}^{\color{#D61F06}{b}} \quad ; \quad \color{#D61F06}{b} = \ ?

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