Front Lower A Arm Control arm shaft question!

[bmxbang]

Guys need some help I have a 71, 2 wheel drive c10 that I’m just now diving into rebuilding the whole front end. I got my parts in today and noticed the new control arm shaft for the lower a arm seems to be slightly shorter than the factory ones. As you can see in the picture the threaded part is the same length but the actual center body seems to not go out as far as the original does. Should I be worried. Included in the picture is the part number. MOOG K6147.