Admob id for banner and ful lscreen ads

Hello friends I need some information on admob. Currently I have integrated admob banner ads to my application and I want to try admob fullscreen ads, do we need to use same admob banner id for full screen also? I do not want to mix banner and fullscreen impressions, for this do we need to create separate ids for both banner and fullscreen? If I mix both banner and fullscreen impressions I might get low ecpm. Please share your suggestions on this.

go for separate ids for banner and inters.

Thanks I will do that.