I think it might be best to consider the mold variation of a single part vs a category of similar parts.
Jumper has had 3 mold variations:
Not groove bottom tube
Groove bottom tube
Groove bottom stud jumper
Where as Tile, Without Groove covers a group of parts:
1x1
1x2
1x2 grille tile
1x4
The mold variation implementations are already seen in practice when looking at 1x1 clip plates and tiles.
Jumper has had 3 mold variations:
Not groove bottom tube
Groove bottom tube
Groove bottom stud jumper
Where as Tile, Without Groove covers a group of parts:
1x1
1x2
1x2 grille tile
1x4
The mold variation implementations are already seen in practice when looking at 1x1 clip plates and tiles.