Serp con rods 4.0/4.6

[Simon says]

Need a quick answer if anyone can help what's the difference dimension wise between 4.0 Serp rods & 4.6 thank you

[tinker-27]

4.0 litre rods are longer , the pistons can be swapped but not rods , ie 4.0 pistons in a 4.6 makes for a high comp 4.6,