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I was told it is for Mac Pro its the same part number it may have come from the late 2013 Macbook Retina. I have been researching it and people said that model number works great and they got better read speeds then the 256. Here are the two Part Numbers Stock Apple 256GB Apple # 655-1803D Samsung Model Number MZ-JPU256/0A6 512GB Apple # 655-1805D Samsung Model Number MZ-JPU512/0A6 My Apple 256 has a link of 4. The same controller chips on board. It seems from the tear down they took the heat sink off. Don't go by the controller logic as it's programed! The M.2 PCIe interface standard logic definitions are on the loose side, we just don't know what Apple is doing here.
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Which I think is the reason it's taking the 3rd parties a bit of time reverse engineering the part. We tried a so called M.2 PCIe SSD in our Mac Pro and we couldn't get it to work (physically looked the same just larger storage like what you are doing). For now I would wait till the major part houses have the units for sale (OWC etc.) Most have announced they will be offering the SSD part just not available quite yet. I had success in taking of the protection / heat sink using a hair dryer a metal spud and a laser infra-red thermometer. Once my hair dryer was not so strong temperature didn't passed from 70o Celsius I didn't wanted the ssd hotter than 80. After some minutes it realized With little effort on the spud. I did it to use the ssd from the mac pro in my Macbook Air 11.
I don't think it is necessarily to use that plate if you upgrade your mac pro. It doesn't seem to be a heat sink since it is plain and it is glue with 2 stickers. It will not cooler the ssd, maybe will even keep the heat inside of it since it is a air cushion. 