Are 10 inch spindles identical side to side?

So, I'm getting ready to align my front end on my 69 340 Swinger. Looking at the spindles, are they able to be swapped side to side? If not, how do I identify?

To answer why I'm asking, looking at the spindle from the wheel well, it looks like the top of the spindle leans slightly forward, when I am sure it's supposed to lean back at the top for caster??