The 1999 ANCHOR BAY extended widescreen HALLOWEEN (1978) is not the same as the 1981 television edit.
The alternate scene of Laurie discovering the bodies of her two friends, in the wardrobe, is an alternate take that is not available on DVD/Blu-ray. There is also another alternate take used in the 1981 television edit - Laurie telling the two children to go next door and call the police. This alternate take is used at the beginning of HALLOWEEN II (1981). But here, it is seen in its complete form.
The 1981 television edit also included two title cards - just after little Michael has killed his sister - which are not included in the extended widescreen 1999 release of HALLOWEEN (1978).