Reversed rotation of HDRI sky to match legacy and removed it from procedural because it does not make sense there.

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/Sky/ProceduralSky/ProceduralSkyEditor.cs

 
             EditorGUILayout.Space();
 
-            base.CommonSkySettingsGUI();
+            base.CommonSkySettingsGUI(false);
         }
     }
 }

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/Sky/SkySettingsEditor.cs

             m_EnvUpdatePeriod = Unpack(o.Find(x => x.updatePeriod));
         }
 
-        protected void CommonSkySettingsGUI()
+        protected void CommonSkySettingsGUI(bool enableRotation = true)
-            PropertyField(m_SkyRotation);
+            if(enableRotation)
+                PropertyField(m_SkyRotation);
 
             PropertyField(m_EnvUpdateMode);
             if (!m_EnvUpdateMode.value.hasMultipleDifferentValues && m_EnvUpdateMode.value.intValue == (int)EnvironementUpdateMode.Realtime)

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Sky/HDRISky/HDRISkyRenderer.cs

         public override void RenderSky(BuiltinSkyParameters builtinParams, bool renderForCubemap)
         {
             m_SkyHDRIMaterial.SetTexture(HDShaderIDs._Cubemap, m_HdriSkyParams.skyHDRI);
-            m_SkyHDRIMaterial.SetVector(HDShaderIDs._SkyParam, new Vector4(m_HdriSkyParams.exposure, m_HdriSkyParams.multiplier, m_HdriSkyParams.rotation, 0.0f));
+            m_SkyHDRIMaterial.SetVector(HDShaderIDs._SkyParam, new Vector4(m_HdriSkyParams.exposure, m_HdriSkyParams.multiplier, -m_HdriSkyParams.rotation, 0.0f)); // -rotation to match Legacy...
 
             // This matrix needs to be updated at the draw call frequency.
             m_PropertyBlock.SetMatrix(HDShaderIDs._PixelCoordToViewDirWS, builtinParams.pixelCoordToViewDirMatrix);

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Sky/ProceduralSky/ProceduralSkyRenderer.cs

                 sunDirection = -builtinParams.sunLight.transform.forward;
             }
 
-            m_SkyProceduralMaterial.SetVector(HDShaderIDs._SkyParam, new Vector4(m_ProceduralSkyParams.exposure, m_ProceduralSkyParams.multiplier, m_ProceduralSkyParams.rotation, 0.0f));
+            m_SkyProceduralMaterial.SetVector(HDShaderIDs._SkyParam, new Vector4(m_ProceduralSkyParams.exposure, m_ProceduralSkyParams.multiplier, 0.0f, 0.0f));
             m_SkyProceduralMaterial.SetFloat(_SunSizeParam, m_ProceduralSkyParams.sunSize);
             m_SkyProceduralMaterial.SetFloat(_SunSizeConvergenceParam, m_ProceduralSkyParams.sunSizeConvergence);
             m_SkyProceduralMaterial.SetFloat(_AtmoshpereThicknessParam, m_ProceduralSkyParams.atmosphereThickness);