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And REALLY don't trust what a color looks like on your monitor, either in an online picture or (especially) a color swatch on a webpage.
Yes. Note that the post-1973 paint mix formulas all include green, but the chips look tan (at least on my monitor). In fact, the color adopted just before the 1973 war was a dingy gray green color, not anything most people would call "Sand". In service this is muted because tanks in the Middle East are nearly always covered in local dust (and photos are also subject to a myriad of other color distortions, depending on brand of film used, lens filters, time of day and printing limitations). Israeli unit commanders were also known to customize the paint to suit the terrain their unit was expected to fight in, since the Sinai isn't the same color as the Golan. Of course, this also means you don't have to sweat exact shades too much. If it helps, one IDF vet I knew favored a 50/50 mix of Model Master US Armor Sand and US Olive Drab for IDF sand gray (circa 1982). He matched it to a dried paint brush from his tank that he brought back to Florida with him.
Some builders sweat bullets, trying to start with an exact paint match, then distressing the paint and adding layers of dirt and grime colored washes and glazes to duplicate what the real vehicle went through. But Francois Verlinden's approach was to paint his models in a color close to where he expected to end up rather than start with an exact match. His US Army vehicles were base coated in any old dull green, not No. 9 Olive Drab, because he knew he was going to weather the heck out them, anyway.