That flightdeck shot clearly shows the panel started life as a 510 even though they've binned most of the Smiths instruments in favour of the more common Collins. Good stuff and a good find
The white aircraft is the 510ED: note the antenna over the front door which would not be present on the other two (ex-TAROM) aircraft. The photo of the tailcone seems to show that the No. 1 engine cowling is either missing or removed so perhaps it's not in service as yet, or is just stored as Garry suggests. The picture is also a good illustration of the hush-kit installation. Zany colour scheme on the other aircraft: EX-086 also saw service with Ryanair once upon a time.