The parent game zip contains all the primary data. The clone or regional variant zips only contain the specific files that differ from the parent. If you delete the parent game, the clones will stop working. This format saves considerable storage space.
A complete reference set consists of three distinct types of files, each serving a specific role in bringing an arcade machine to life: Does the MAME 2003 core support CHD images?
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Let me know which emulator (like RetroPie or MAME2003-Plus) you're using so I can give you the best advice! Libretro MAME 2003 Plus | Recalbox Wiki
The mame2003 core is deeply integrated into RetroArch. This unlocks modern features for vintage games, such as netplay for multiplayer, advanced CRT shaders, retroachievements, and universal controller mapping. The parent game zip contains all the primary data
The Ultimate Guide to the MAME 2003 Reference Set: ROMs, CHDs, and Samples Explained
Are you getting any specific when booting games? This format saves considerable storage space
This comprehensive guide covers everything you need to know about the MAME 2003 Reference Set, including ROM types, CHD management, and optimization strategies for your retro gaming setup. What is the MAME 2003 Reference Set (MAME 0.078)?
The MAME 2003 Reference Set is a specific version of the MAME emulator that was released in 2003. This reference set is based on MAME version 0.078, which is a significant milestone in the development of the emulator. The 2003 Reference Set includes a comprehensive collection of ROMs, CHDs, and other files needed to run a wide range of classic arcade games.