Equivalent circuits with one or multiple resistors
Clearly not!

Consider if R2 is 0 ohms, then in the op circuit there is NO VOLTAGE developed across any of R2-Rn because they are all short circuited by the 0 ohm R2. Clearly further in the first circuit the voltage is the SAME across all resistors R2-Rn because they are in parallel.

In the second case you have a number of individual potential dividers, so having a zero ohm resistor for R2 only means the voltage drop across R2 is zero, it says nothing about R3-Rn which may all have different values and form different potential dividers.