The heatsinks on these are too deep - no, the drive with the heatsink won't fit. These systems are designed to use a metal plate specific to Dell -- you'll need that plus the drive without the heatsink to fit inside the system.  
I'm planning on adding a 1tb secondary SSD to my laptop and I was hoping to find out if there's room for a SSD with a heatsink. I'm looking specifically at a  WD_BLACK 1TB SN750 NVMe Internal Gaming SSD Solid State Drive with Heatsink. The size difference is pretty small at 0.08 width and 0.23 depth, but I don't have the computer in hand yet (thanks, FedEx) so I can't just pop it open and check.
G15 5515 Ryzen Edition SSD with heatsink