Perhaps.
Save the settings from the AC1600 and see what information is being captured. Map that to the AC1900. If there is a one-to-one correspondence then you might give it a try.
And I would expect that the AC1900 would report some problem or incompatability error if it did not recognize or otherwise "like" the incoming file from the AC1600. Some error would show up.
Then again the AC1900 might just say okay and accept the configuration file. Still no guaranee the file's data would work.
I would think, worst case, that any problems would be done away with via a factory reset on the AC1900.
But, to be honest, I would simply contact Linksys via email and ask them. Then maybe a chat to verify and get a "second opinion"...