On Sat 4 Aug a press conference was held by Pres. Zelensky to show the first batch of promised F-16s were delivered and flying in Ukraine.
According to two sources, 80-3596 and 80-3599 were seen as flyers, this would make them former RDAF E-596 and E-599. A total of 10 was mentioned in online Ukranian sources, which should include 6 former RNLAF examples.
On the ground two non-flyers, one had 84-1378 on the air intake cover, although not firm confirmation, it would make it a former USAF F-16C, ex 509 AMARG store. F-16.net makes these two F-16ADF variants, but non-flyers anyway. I am sure more details will pop up in the coming weeks.