Regarding the ten ROG 319s/769s, 319009 and 010 have been converted so far, but it seems very odd to have the last three digits as 501 and 502 respectively. The GWR ones seems to have kept the last two digits, with the preceding one changing to a 9 (the mighty Great Western Railway keeping with tradition by doing things their own way?).
Would it have been easier to have kept the existing last three digits? It seems renumbering for renumbering's sake, and one of the many reasons as how the country has ended up in the terrible state it is in nowadays.