I don’t think there is any difference other than the number/type of pins on cuda shaker emblems. The Challenger shaker emblems for 440-6 and hemi were different than what was on the bulge hood.
Not sure if cuda 440-6 shaker emblems are repro’d. Mitchelll motors has some “NOS” ones listed on eBay but I think Frank Mitchell had a bunch of emblems repro’d years ago and sold as NOS. Either way they may be the only game In town. I am sure there is a different part number for the shaker emblems.
https://www.ebay.com/itm/1970-1971-Plymo...Par/7994022972?Be aware that pins on the shaker emblems are longer and thicker than normal pins.
