Both fasteners are called “eddie bolts” and are similar in appearance except for a number stamped on them. The titanium bolts cost about $5 apiece, while the Inconel parts cost about $20 each. A Lockheed spokeswoman said the two parts are “very difficult to distinguish, visually.”
Maybe not visually, but titanium bolts feel like feathers compared to steel or Inconel bolts - they are much lighter...
I've used both and I can't imagine not noticing the difference in weight - even on small (10/32) bolts.