Stack 2 production 9200 switches with existing configuration

[chong.eric]

Hi,

I have two catalyst 9200 switches which in production and i plan to stack them.   My question is if i just connect them with stack cables , what will happen to the switches?  Will all the existing configuration be wiped out?  Will them form the stacking? Both switches are running same version.

[Kasun Bandara]

config will replace of second switch by first switch's configuration (which will select automatically or you can configure manually the switch number)