[GNC] GNUCash 3.x and 4.x compatibility

[Kevin Exton]

Hi All,

I normally use GNUCash 3.x on Debian 10 (Just whatever is currently in the
stable repositories to make my life easy).

Recently I have a need to also use GNUCash on a Windows machine. Are there
compatibility issues between GNUCash 3.x and 4.x if I run them on the same
data backed up in Dropbox?

I'm thinking maybe I will need to install a new version of GNUCash on
Debian. Or an old version on Windows.

Thanks All!
Kevin