Hook up new thermostat
These pictures seem to be programmer baseplates,programmer plugs into,if so the new base plate connections will differ.It has to be assertained by careful circuit comparison that all switching is observed,connection will be dependant on   the control devices ,lettering of connections is normally used to assist following the instructions.You have taken on a tricky job,with instructions it is possible to get it right,experts sometimes have trouble.Check to see if the new programmer will plug into the old baseplate.Careful not to damage it,hope this helps Steve uk engineer.