EQClassicHD biggest changes are to armor and weapons and models. the "highres" zone textures link on the same page are basically the luclin world textures.
Highres 4X HD are superior world textures to those found on the EQClassicHD page.
So do this:
1. install Highres 4X HD
https://wiki.project1999.com/Highres_4X_HD
2. Install (and overwrite) EQClassicHD
https://wiki.project1999.com/EQClassicHD
classic textures that arent a blurry mess of shit. theyre sharp and clear. because remember, back in 1999, low resolutions and lowres textures didnt look terrible ON A 15" monitor. Anyone who shuns these texture packs because "they want a classic experience" are out of their minds - get these texture packs and fill your 30-40" monitor beautifully. obviously your zone loading times will increase. mine increased by about 4 secs on a SSD.