In order to answer, I need to know...
Where is the sun in each pic? (no shadows to tell me)
How far away is the camera? (in left, impossible to tell, as bottom is obscured by trees which may be near to or quite far from plume)
What time of day for each? (mostly for spectral reasons, but also for angle)
What atmospheric conditions? (dry desert air absorbs different spectral frequencies than humid air)
What is the composition of each plume? (for spectral absorbtion)
What is the density of each plume? (for spectral absorbtion)
What is the make of camera for each pic? (spectral sensitivity of chip)
Some of these can be adjusted for; if we know the camera makes, we can adjust. If we know the illuminating spectrum, we can adjust. Angle could be a bit more difficult, as it interacts with composition of plume and density.
Unless you know each of these variables, you have unaccounted-for variability that could invalidate any "it looks similar" sort of analyses.
How about find me a photo of a plane crash plume that looks like Val's.
Also find me an explosion similar that 93 made.