I'm not Ed, but, in theory it may prove helpful for "
some" add-on scenery packages to be (re-)compiled with the P3D SDK specific to the version of Prepar3d in which a add-on scenery is intended to be used.
However, on a practical basis, unless certain '
special' scenery content (such as "
Dynamic Lighting" etc.) that is specifically available / displayable
only in a particular P3D version is actually implemented by the developer within that add-on scenery package, IMHO, there is
NOT likely to be a significantly perceptible performance hit by using a add-on scenery package compiled for FSX ...with P3D v3 or P3Dv4 on a computer powerful enough to run either of those Prepar3d versions.
I'd suggest still trying any of Ed's FSX SDK-compiled scenery packages in P3Dv4 anyway... it won't break anything.
FYI: A pertinent discussion thread on this topic at FSDeveloper:
http://www.fsdeveloper.com/forum/th...orting-from-p3dv3-to-p3dv4-is-a-no-go.440336/
GaryGB