Should I change SSID & Password after firmware switch

OK so I cant stick with the merlin firmware on this router because of one issue.

I will be flashing it back to the original ASUS firmware. My question is as follows, All my wireless devices will connect back to the router once I set up my SSID & Password (same as old one)

Is this a good idea? With all the firmware updates and reset's does everyone keep there original wifi details etc?

Thanks