The 11954 is usable as alternate for the 62531.
In some cases the 62531 is usable as alternate for the 11954, but not always.
Click on a colored part below to see the Sets and MOCs that use part 62531 Technic Panel Curved 11 x 3 with 2 Pin Holes through Panel Surface in that color. You can find an overview of all LEGO Colors here.
If a color is missing, it probably needs to be added to a Set Inventory.
This part has been used by MOCs in the following colors but not officially released.