Yes, there are OS3 68020/30/40, OS3 68060 and OS4 versions. The 68020/30/40 version makes uses of some assembler optimisations that use the 64-bit math instructions available on these processors. Those instructions were removed on the 68060, hence it has to use the slower C-based code instead, albeit with some nice optimised 64-bit math code by Frank Wille, to help minimize the loss. It is important not to install the 68020/30/40 version on a 68060, otherwise it will be extremely slow (caused by emulator trap interrupts).