Not my statement but a repeat of what an engine builder that has worked with both heads told me.

These were W9-RPs and SB2s. He said he used they same program on his CNC to port both.

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Somebody misspoke. The P7 and SB2 can share parts of the same program. The big difference is bore spacing the Mopar has a larger bore space. You use the same CNC program and the valves are going to be out of place on the end cylinders by a large margin. The W9 RP is no where close as it is a wedge design where the SB2 is a canted valve arrangement. The intake ports are not even in the same ball part. I'm told the SB2 and P7 share the same port on many CNC programs.

Leon