u/Individual_Glove9415

I’m replacing a Honeywell with a Sensi but the letters don’t match. I have a red wire going to R which I think is the heat so on the Sensi that would be RH. There is a C wire going to R and RC which I’m assuming would be RC and RH on the Sensi. Then there’s a green wire going to OB but I’m not sure what the green wire is for but it matches the OB on the Sensi. When I try to set up the app it says this set up is not available. I just have heating.

Is the R on the Honeywell same as RH?