Are the colors identical to the Gretag Macbeth 24 set? (They look like it, but want to be sure)

No, Xrite ColorChecker classic.

Is this too good to be true? I am just wondering why the X-Rite costs so much more?

At this time, The X-Rite Color Checker Classic is however, “Out of Production”. Upgrades to the product are being made through Calibrite, however the ColorChecker Classic will not be available until 11/18/22. That being said, it takes more than an expensive color target to utilize the color target without additional software, knowledge of color calibration and in some cases additional hardware; depending on what you are attempting to calibrate - your monitor/display, your printer, your video, your web files etc. A good understanding of color calibration with Any color target is essential to faithfully reproducing Your color target for Your needs. I would suggest, an understanding of color calibration is worth more than the price of an expensive color target.

Does this product come with associated RGB values for each color?

It seems not, but others have noted that the colors are as "XRite Color Checker Classic". If you do a search, you'll find that XRite actually do publish the color values for theirs, on one of their pages (can't link to it of course, external links get killed, but I found it on the first page of results)

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Camera Colour Correction Card – 4x6 for Photo and Video - Reference Tool Grey Card Target White Balance Exposure Temperature Colour Calibration Chart, Set of 2

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