that they were all made by the same company. Look at the ends...

The 2 on the left have "heads" that look kind of like wooden beads...the stick shows, and they won't stand up on their own.

The one on the far right (El Rancho Vegas) has concentric grooves, and the center seems flush.

The red one (3rd from left, Mapes) has concentric grooves, but the center protrudes. The yellow (Mapes) is similar, but the grooves aren't as defined.

The Green Sands has the protrusion, but no grooves.