The used Mini Modulars set I bought on eBay came with some yellowed white pieces, which happens and are easily replaced.  What I found curious is over 100 of the Light Bluish Gray pieces had color variations (Light Bluish Gray vs. Light Bluish/a Brownish Hue Gray).  I feel this may be normal, but probably not within a set itself.   I do not think the seller did anything wrong and that is the way the set came.

I ordered replacements for the Light Bluish/a Brownish Hue Gray pieces on BrickLink and three of those had the color variations too.

What I am wondering, how many of you have experienced this when buying and the assembling a new set?

 

I don't know that I've experienced any color variation within a new set, however, I have seen it many times with a used set.  It is especially true if the person substituted missing pieces and didn't pay attention to color variation.  Admittedly, it may not be noticeable depending upon assembly order.  

The used Mini Modulars set I bought on eBay came with some yellowed white pieces, which happens and are easily replaced.  What I found curious is over 100 of the Light Bluish Gray pieces had color variations (Light Bluish Gray vs. Light Bluish/a Brownish Hue Gray).  I feel this may be normal, but probably not within a set itself.   I do not think the seller did anything wrong and that is the way the set came.
I ordered replacements for the Light Bluish/a Brownish Hue Gray pieces on BrickLink and three of those had the color variations too.
What I am wondering, how many of you have experienced this when buying and the assembling a new set?

 

Normal. I have this problem with the modular Diner in that some colors have different tints in the same set.