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You should have learned that in an RC circuit the capacitor charges from the resistor exponentially which is not a delay.
The second circuit is CR where the capacitor cannot charge immediately so it passes the entire 0V to +5V leading edge then it charges into the resistor exponentially.
Case 2 is confusing in this thread that has a +5V sudden rise into an RC for A and into a CR for B. The capacitor always begins discharged.
The sudden rise would originally sound like POP. A delayed version would also sound like POP. But the RC cuts high frequencies which would sound like THUD and the CR cuts low frequencies which would sound like TICK.