One of the many rules of thumb for the Toobworld concept is that whoever first plays a particular role becomes the official "televersion" for the main Toobworld (Earth Prime-Time). Any recastaways that come along later in a remake* would be relegated to another TV dimension - unless a splainin can be provided for the recastaway to be the same character as the original**.
GEORGE SHUMWAY - 'Mary Hartman, Mary Hartman'
Played by Phil Bruns & Tab Hunter
Splainin - Plastic Surgery
SHERIFF'S DEPUTY ANDY - 'Eureka'
Played by Ty Olsson & Kavan Smith
Splainin - Rebuilt Android
DARRIN STEPHENS - 'Bewitched'
Played by Dick York & Dick Sargent
Splainin - Magic Spell
(This is also the splainin for Darrin's neighbor Gladys Kravitz and Major Tony Nelson of 'I Dream Of Jeannie')
And then there's always the Time Lords of 'Doctor Who'.....
Splainin - Regeneration
For the last couple of seasons of 'Smallville', Justin Hartley played Oliver Queen AKA the super-heroic archer Green Arrow. But even though he was the original for that role, he was in a series where the main character - Kal-El/Clark Kent/Superman - was a recastaway. For Toobworld, George Reeves in 'The Adventures Of Superman' was the official Man of Steel... even if he did die back in the early 1960's due to Kryptonite poisoning.
So now we have a TV series dedicated to this hero, 'Arrow'. And because it's unencumbered by connections to 'Smallville' (which is in the 'West Wing' TV dimension, by the way), we accept Stephen Amell as the official Green Arrow/Oliver Queen of Earth Prime-Time.
* This does not include recastaways within the same original series.
** Even rarer are the recastaways who can share the same TV dimension as the originals, but we do have one this season. More on that in an upcoming post.....