No reason you can’t, but it will be more expensive that an off the shelf AIO. As long as there’s mounts for your cpu that fit the pump/cpu block combo then there should be no issues. That being said if you want better performance than your Kracken you’ll need a larger/more radiators than the 280 you have now. If you’re not throttling I’d actually recommend you swap the idea, keep the cpu aio, and create a custom loop “aio” for your gpu because that’s where most of the noise/heat in your system comes from.

Edit:

https://www.amazon.com/Alphacool-Eisbaer-Aurora-Water-Digital/dp/B07WNKD7V7/ref=dp_fod_sccl_1/137-6864318-8442502?pd_rd_w=ekBsk&content-id=amzn1.sym.10168032-b141-4c53-8385-6387ee8d5b2d&pf_rd_p=10168032-b141-4c53-8385-6387ee8d5b2d&pf_rd_r=EQ675RZ9WDWW08TCH86C&pd_rd_wg=0FuNO&pd_rd_r=eaf9f8ad-774d-41a4-8afa-cf278aeccd8a&pd_rd_i=B07WNKD7V7&psc=1

This alpha cool pump/cpu block fits am4, is available, and is cheaper than the pro model you linked if you still want to do the custom cpu Aio and keep cost down.