The 1007 has 2xxx seating which was done almost a decade ago, they experimented with a different facing seats layout but didnt like it and reinstated the old forward facing seats but as the original seating supplier was not around anymore they used the seating supplier for the 2xxx series.
What may be confusing you is they will have had effectivley two mid life refurbs, the first called 'Special projects modifications' is the cctv mirrors, internal and external pids, covered bogies and couplers, speed probes, reliability improvements and a few other minor things has been running for the last 4 or so years and is almost complete with only about 5 first series and 4 second series not recieved it yet. Its been done in stages and more mofications and improvements have been developed as the programs gone on and been added which is why its taken so long. The second is called the 'Mid life refurb' and is a thorough mechanical and electrical overhaul replacing the key components such as obsolete circuit boards, reconditioning of the bogies and structural frames, interior panelling and seats. This is about to start this year.