These hand grenades reflect modern design trends, using plastic molded components.
The M75 Grenade on the left uses a common "mouse trap" style fuze mechanism, first developed by the U.S. at the end of WWI.
It has a cocked striker held back under the lever.
The M93 Grenade on the right continues to use the percussion style found on the Mod.1917 grenade.
The M93 Fuze is little changed from its WWI predecessor, except for the use of plastic instead of metal. A curious design choice for a modern grenade.
The vent is now located on the side, rather than on top.
The fuze thread is reversed on the body so a normal untwisting action for the protective cap won't inadvertently unscrew the fuze.
Ridges on the outside are to provide a secure grip surface, not a segmented frag matrix.
Differences in the internal body construction are an interesting feature too.
The internal fragmentation matrix consists of a matrix of many small steel balls for the M75, but change to a segmented steel coil for the M93. Possibly to insure more consistant blast coverage?
As with the M52P3 there is a plastic transport can for the M75 as well.