I have Windows 8.1 on my desktop and laptop computers.
I own Windows 7 Ultimate and have the disks. It is not installed on any computer.
Is there a way I can get 10 Pro for my laptop?
The upgrade path is........
Home for Home.
Pro for Pro.
32-bit for 32-bit
64-bit for 64-bit.
Therefore, if your Win 8.1 copies are Home ( non-pro ) versions, then both your desktop and laptop will get Windows 10 Home.
As already suggested to you, if you want the Pro version that bad, install your Win 7 Ultimate to your laptop. Make sure to install SP1 afterwards.
Your laptop with Win 7 Ultimate SP1 will get free upgrade to Windows 10 Pro.