It's unlikely to fit -- the device itself is 3mm but the mounting hardware is quite a bit more space-consuming. Also realize that you likely don't even need the heatsink.  The 980 Pro does run hot when it's running at full speed, which I noted in your other thread, it will not in your system -- it will only run at a fraction of the rated speed due to limitations of the system board.  
Good evening everyone, my question is if the Samsung 980 Pro SSD M.2 NVME will fit in my laptop Dell Latitude E5470 with this heatsink Amazon.com: QTEATAK 2Pcs PCIe NVMe M.2 2280 SSD Heatsinks Cooler & Mounting Screws Screwdriver Kit… : Electronics, if it won´t fit with that heatsink then could you recommend me one to avoid the Samsung NVME disk from burning? Thank you, hope for your answer
Will a SAMSUNG 980 PRO SSD 1TB PCIe 4.0 NVMe Gen 4 M.2 Internal SSD fit in 
Latitude E5470?