Quick question if I have a updated versions RPA do I need the old versions still?
Maybe too quick, since I do not understand what you are asking.
I guess it is about updating game. There is FAQ page in the Wiki and faq channel on Discord.
OK, now it is clear.
You can not remove any of the .rpa files. When doing the update using the patch .zip, the new files overwrite the old or it is a new .rpa. The .zip has README file inside that tells how to do the patch.
Version v0.19.1 has 17 .rpa files in the game/ subdirectory. They are all needed.
If your current version of game is v0.18.1 or older, you must install the older patch files first. Patch files for v0.1.16 and older are available from developers Patreon, just scoll old messages until old enough items appear.