Yes, it is the clone. Keyboard firmware could be different too -- the one we have is good enough to work with drivers that don't send anything to keyboard, or run simple tests (f.e. ms0515 sends LK_CMD_REQ_ID and receives expected response), but vt240 does much more (programs modes for various keyboard divisions etc. --

Agat-7 (the Apple II non-clone) can use a variant of this keyboard with very different firmware and simpler hardware.