Are the seats in UA Premier Economy different than the traditional Premier Economy seats on a "traditional" domestic UA flight? I see they have 111 degree recline, but I'm not really sure what that means. Do we start at 90 degrees, so 111 means it leans back 21 degrees?

Sorry for the simple questions. I normally fly business, but this is a vacation flight and the cost of UAs upgrade lottery is getting too high - thinking of flying coach...9+ hours. I've only done one long flight in coach (HKG - ORD), years ago, and I was pulling my hair out on that one - standing most of the time and using drink chits like water.