Is mkswap hw dependent?

I'm setting up Home Assistant, on a Raspberry Pi, to use Network Boot with a Ubuntu x86 server. The initial bootup seems to be working. The systemd process is now creating a swapfile on the NFS mount. But it is very slow. **Question** If I used the NFS server's Ubuntu commands to create the swapfile and mkswap, would the swapfile be usable from the RaspberryPi? Or is the format of a swapfile dependent on the Linux OS or HW? PS The slow swapfile create process is not due to networking, everything is hardwired Ethernet.