We make no claims of compatibility with M4-78 or EE, regardless of version. It may work or it may not, that's up to the enduser to determine. TSLRCM is probably still fine, I don't think any radical changes were made.
K2CP is pretty innocuous at the moment, it doesn't make anything like the sorts of changes K1CP makes, so it's probably fine. But nobody has assessed the current status formerly as of yet.