I agree with JMD. His insights are good. I'll add this:
The Emperor is Aries, a fiery man who can be charismatic as well as controlling, but also tempermental and childish. He wants it HIS way, and he expects to have things HIS way. On the positive side, he can do great things, move mountains, when he takes charge. It's not always a bad thing to have him be the boss.
The King of Pentacles is more likely a Capricorn; ambitious, and much more solitary than the Emperor. Old manish rather than childish. The Emperor likes having lots of people under him, eagerly doing what he asks--he wants them energized and excited to do what he wants, to cater to his whims. He thrives on it. But the KP wants people working like clockwork, maturely, responsibly, exactly as he told them. Whether they're happy or excited doesn't matter so much as that they care as much as he does about doing it right.