is there a method to do that ?

thank you

what is your end goal, can you be a bit more descript?

You could unpack them both and build a manifest that includes all files, but that would probably result in the equivalent of installing them seperately back to back.

Installing them independently with a single command or file would be hella-easier if it meets the same need.

I dont think this is possible without re-packaging or combining the original project files. You should probably use a MSP. MSP files are MSI patches, basically differencing installers, which contain only changes from the original installer.

I am guessing RapidInstall could be your friend for doing that.