If I understand your question, you're asking whether electrolyte resistance is the same as the value often called "solution resistance" when fitting an impedance spectra to an equivalent circuit. Many would say these are the same, but I wouldn't, since there are many other sources of resistance (ionic and electronic) included in the "solution resistance" component of an equivalent circuit. In a well-designed electrochemical cell/setup, the sources of electronic resistance (cables/connectors between electrodes and potentiostat, electrode bulk solid resistance, etc) should be negligible compared to the ionic resistance of the electrolyte; but this can't always be assumed.
Please check the website:
https://chem.libretexts.org/Bookshelves/General_Chemistry/Chem1_(Lower)/08%3A_Solutions/8.10%3A_Ions_and_Electrolytes/8.10.9A%3A_8.10.9A%3A_Electrolytes_and_Electrolytic_Solutions#:~:text=Electrolytic%20solutions%20are%20those%20that,is%20ordinary%20salt%2C%20sodium%20chloride.
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