Yes it is. Incidentally the only components that the shared between the K4 and KV6 are the liners. Every other component is different between the two engines.![]()
It was the liners that made me ask as I remember being offered a FL1 2.5 V6 for £100 that had cracked/slipped/porous liners and a little bit of googling showed the same part for both engines, I didn't buy it but wish I had