Color matching can be tricky unless you are buying butons and balltop from the same manufacturer and/or you can do a side-by-side comparison.
Eds1275 suggested a wiki page like
this to compile this type of info.
If anyone can do a side-by-side comparison of two or more products (buttons, balltops, battops, t-molding), please tell us your first-hand observations in the thread
here.
Let us know what specific products you find that:
* Do color-match
* Almost color-match
* Don't color-match
* Don't color-match, but are complimentary colors (Not certain about this designation, LMK if it's a bad idea.

)
* Match (or don't match) texture/finish
Example:
The yellow IL Compact battop stick color-matches the yellow Goldleaf pushbutton, but has a different (matte) texture.
The yellow Arcade Prime pushbutton almost color-matches the yellow IL Compact battop, but is slightly darker and has a different (smooth) texture.
Scott