To put it bluntly, no LTE module is supported in the WR44v1.
You can see this under "LTE module support" in the latest release notes. http://ftp1.digi.com/support/firmware/transport/flashwriter/5235/Digi%20TransPort%20Release%20Notes%205235.pdf
Saying that a module is not supported does not mean it won't work.
The hardware changes were to make it more suitable for LTE especially from noise. This meant that among other things the throughput and connectivity were most likely unstable.
If you do go ahead and change it yourself obviously you void all warranties but you will most likely get it to work. The throughput and stability would be very questionable.
There may also be other concerns such as power draw that have not been investigated as this device is not supported in this configuration.
All module configurations are held in the config.fac etc so if you are out of warranty, do not wish to get official support and accept all liability then give it a shot. Just remember to select the correct module when you flashwrite it.
Hope this helps,