ORD 2020 R3 - has there been a schema change?

Is ORD 2020 R3 compatible with 2020 R1/R2?

Or has there been a design schema change which would require updating all older projects and resources?

I would like to take advantage of the new bug fixes, added tools and other upgrades, but I do not want to update if my older data will no longer function. I have been using the workspace files from my DOT (early preview that they are) and I do not want to update the software if I will no longer be able to use those files. If R3 IS backward compatible, I look forward to giving it a test drive.

Thank you.
MaryB