yes they are - you can easily convert the older mount with later plates - i had a set of old conferr skid plates that adapted mine
supposedly this gives better articulation with the longer shocks
see how the later shocks were mounted at the bottom of the spring vs yours at the top of the spring - this could be somthing you need to check - hard to tell with the boot on - - for your mounting scenerio the front and rear shocks should have the same part number - not different
looks like you ordered the rear shocks for the 75+ 40 - the shock mounted different location. All 4 shocks for the early 3speed 40s are same size front & back - 4 speEd backs are longer
i HATE the way these look - i got a correct size stainless hose clamp - cut the zip tie off and the boot now...