Bombs,
as we discussed the other day, here is a shot of the M42 series of submunitions. L-R, M42, M77, M46. The is no external difference that can be used to identify which model of bomblet, with the exception of the wider ribbon for the M77. The wider ribbon was necessary because the M77 is released from the MLRS rocket, at a different velocity than when the M42 is released from the projos.
As you know (for the others reading) the M46 is identical externally to the M42, but the M42 is embossed (pre-fragmented) and in firing it was found that this weakened the submunition walls to the point that the bottom row of submunitions in the carrier projectile would fracture. So the bottom row is loaded with non-embossed submunitions, the M46. The pink ribbon on the XM body was another means of pattern testing with inert munitions. After firing you could walk around your gridded area and see the location of each of your M46s vs the M42s. For MLRS this was done rocket by rocket with painted bodies instead of ribbons.