Curiosity of Variegation

Multiplying African Violets 

Tiger Trail (6897) 07/13/1988 (P. Harris) Double bright fuchsia/pale pink back. Variegated, quilted, glossy. Standard trailer.  

I received 4 leaves of this plant in September and need to check with my friend in Montana to see if they came off the same plant? It's a curious thing! 
I'm watching the differences of variegation in leaves growing out right before my eyes. One solo cup of leaves has pink variegation and one has white? 
Same variety . . .
Is it something I've done? :)

Their tray has them both together, just off center from the middle of the shelf, fairly direct beneath the tubes.
My thinking was that I might have put 2 with more variegation in one pot and 2 greener ones in the other.  From the picture I cropped taken at the time, this doesn't really seem to be so. I remember trimming just a snip from the side of one; one leaf was mushy on the edge so it got trimmed heavily,  trying to be sure a few plantlets grew. 
I trimmed the others only after babies appeared and the mother leaf was awkward in the tray.

Leaves have been set on my shelves to produce new plantlets in 3 waves of time - which only seemed farther spaced apart than I remembered, once I checked the dates on the cups.
So it shouldn't have come to much surprise to find all the babies are at about the same stage.  
August 20 - Ebay batch of misfit clearance sale plants. 
September 14 - Montana to Maine box of joy, towards replacing some old favorites and new. 
And the Round Robin leaves arrived September 19.

In answer to my questions, Tiger Trail's history has been detailed here!

Snip of tray photo - Sept 17th arrival - tag not showing but I can tell!