DM8042 & DM8044 compatibility

Hi, I want to know if DM8044 is backwards compatible with DM8042. Will Networks with mixed nodes (some with old firmware, some with new firmware) operate properly?

There is some guidance regarding compatibility in the Product Notification on the DM900 firmware page:
http://ftp1.digi.com/support/firmware/pcn.xbpdm.20090930.pdf

Since these are both 8x4x releases, the major functions will be compatible. Please refer to the firmware release notes for a list of bugs fixed and enhancements made.