No, they where not the same on the production cars I have seen several later 440 production blocks, the 1965 C body blocks also had those, that had the bosses cast into the driver side front so you could use them in the 1967 to 1969 H code A bodys. The 1965 C body blocks can be used in the 1967,68 and 1969 H code cars also. I had a 1975 440 motor home block that had them on it threaded and ready to go I used that block in my 1969 GTS H code 4 speed car for years to bracket race it with a 727 and the stock mounts with a strain strap on the left front I've also seen some blocks that had the blank bosses cast in with no threads in them IHTHs. The M code A bodys had a different K member also