Is the sstate cache sensitive to different releases and or the ordering of the bblayers? We are upgrading our Yocto-based distro from dunfell to hardknott. So for a while we will be building our distro on both releases. Do we need to keep the sstate caches separate for these builds?

Another related question... Does changing the order of the bblayers corrupt the sstate cache (ie require a fresh sstate)?
Thanks