yeah ok in a perfect world buddy. Half the people posting here have somehow inherited these from someone who never descaled their machine once in 4 years.
same brew group basically, the orings are interchangeable. The gearbox changed but the wet end where the brew group connects is the same on the newer models
One thing I forgot to mention when taking it all apart the side panels have a little channel on the bottom where water drains into a tray under the machine. Make sure it lines up with the channel on the case otherwise you'll get water inside the case which will lead to stale coffee water with a smell of death. At least that's what I learned after doing it the first time when I had to start over after two weeks.