Hi,
Short answer is No.
The cpu and gpu are hard mounted onto the systemboard.
Here’s a link to the [https://topics-cdn.dell.com/pdf/alienware-15-laptop_service-manual_en-us.pdf|service manual]
Here’s an image taken from the service manual that shows the cpu and gpu on the systemboard after the removal of the heatsink.
[image|1512770]
(click on image to enlarge for better viewing)