Actually, not exactly! The Grindhouse has a notable green shift, especially in the space sequences, and as Harmy explained, the colors are not representative of the colors of a projected print.
The regrade itself is not meant to be representative of any specific color grading, other than a reduction of the excess green, and the lowering of contrast, which is pretty high for the Grindhouse at times.
The actual colors of the theatrical presentation of the film are less green. In other words, skies are not teal, and the desert (at least for the C-3PO/R2-D2 shot) is not golden. Here’s a photo of an unfaded 16mm print of ROTJ, which is generally more contrasty than the 35mm, but does feature the same color timing in terms of hues:
Here’s the Grindhouse regraded to match the 16mm: