You can use any text editor to look inside PZ2 file (you can't with PZZ because they are compressed)

For example, below is injecting base morphs to V4

{
 version
 {
  number 4.01
 }
 readScript ":Runtime:libraries:!DAZ:Victoria 4:Deltas:InjDeltas.V4BaseAll.pz2"
}

But that points to another file, so we look in that and see what it wants (part below)

{
version
 {
  number 4.01
 }

** readScript ":Runtime:libraries:!DAZ:Victoria 4:Deltas:Base:InjDeltas.CTRLTongueSide-Side.pz2"
 readScript ":Runtime:libraries:!DAZ:Victoria 4:Deltas:Base:InjDeltas.DSTStrength.pz2"
 readScript ":Runtime:libraries:!DAZ:Victoria 4:Deltas:Base:InjDeltas.FBMMale.pz2"
 readScript ":Runtime:libraries:!DAZ:Victoria 4:Deltas:Base:InjDeltas.FBMMaleNS.pz2"
 readScript ":Runtime:libraries:!DAZ:Victoria 4:Deltas:Base:InjDeltas.FHMGeorge.pz2"
 readScript ":Runtime:libraries:!DAZ:Victoria 4:Deltas:Base:InjDeltas.FHMJohn.pz2"
 ....and more stuff**

so make sure the files are in the folder it is asking for.